I believe cooperative research with the Snake Sannin is a valid alternative to going missing that we ought to at least consider. I don't know if its the preferable route, long-term, but for a couple months? It seems to have only benefits. Our primary reason in wanting to go missing is to be able to research the discipline. We have been presented with an easy and risk-free way to do it which does not come with anywhere as big a sacrifice as legging it and losing the safety of Leaf and our power base therein, including political clout and social connections to powerful ninja as well the entirety of Clan Gouketsu and our Uplift reforms. We are on a clock to Painpocalypse and it is ticking. We need every advantage and opportunity we can get and long-term collaboration with Orochimaru offers many.
I like the idea, but this feels like the sort of angle where the Jashin's in the details.
Ultimately, our goal here is to maximize research done (on runecrafting and/or necromancy) without getting caught by the Akatsuki. Getting caught doing runecrafting yields it to the Akatsuki, which Hazou and Orochimaru both agree is unacceptable. Getting caught doing necromancy makes the Akatsuki intent on killing us.
I'm not
primarily worried about the Akatsuki catching Hazou in the middle of his research, if I'm being honest. We take our own OPSEC precautions, interrupting a sealmaster mid-research is generally considered unwise, etc. Rather, what I'm worried about is the Akatsuki showing up and demanding to meet Hazou and then interrogating him. In such a scenario, we wrap up our high-OPSEC research, go meet the Akatsuki, and then spills the beans because their Deceit beats his. "Hazou, you have been obeying my order, correct?" --> "Uhhh yes." --> "I don't believe you. If you want to live, tell me what you have been researching and why you think I shouldn't kill you for it."
Doing our research in the Basement doesn't do much to ward against this. If the Akatsuki want to meet Hazou and interrogate him, they're perfectly capable of waiting until we surface for the day, or grabbing one of our clones instead. I must stress: we have reason to expect the Akatsuki to
specifically be interested in
specifically getting to interrogate Hazou, in a way that means they will not be dissuaded by small roadblocks. If we cannot abide an interrogation (and we cannot, no matter how good our OPSEC was, if we go ahead with forbidden research) then we need a
major roadblock to stand a chance of avoiding interrogation.
So we'd have to lean further into the Orochimaru collaboration, staying in his Basement at all times in a way that puts Orochimaru between us and the Akatsuki. This is... expensive. Even provided Orochimaru would agree to this (and I feel he is unlikely to choose to shield us against the entire Akatsuki if he knows that's what we're intending), our contact with Leaf drops precipitously. It is essentially impossible to do clan head work, for instance, from within Orochimaru's basement. It's also not a pleasant location for dates with Ino, or to hang out with Noburi, etc. We've also recently seen how our family treats proximity with Orochimaru as a constant risk to our health and sanity: even if we convince them that we have not already "come back wrong" when we describe this plan, they would likely expect that to happen over the course of our new living conditions.
In truth, I expect a stay with Orochimaru sufficient to ward off the Akatsuki would be comparable to going missing in a lot of respects. We don't officially betray Leaf, is really the main difference, but even supposing everything resolves all hunky-dory then we're still the guy who (in the eyes of the world) pretty much became Orochimaru's apprentice, and that stigma is also going to cling to us.
But if you really ask me, I don't think even this route would be sufficient to stop the Akatsuki. I mentioned earlier that they are specifically interested in specifically interrogating Hazou. He mentions it in this very update, but him retreating into Orochimaru's basement could easily be seen as a sign of probable guilt, that we have something to hide from the Akatsuki. If you were the Akatsuki in a situation like this, would you pack up and go home? Of course not. You would redouble your efforts to reach and interrogate Hazou, since you now have strong reason to believe that if you don't he will attempt to stop your plans in their tracks. Even if Orochimaru drew a line in the sand and said "I will not surrender Hazou to you and will fight to the death to protect him" (and I again feel like Orochimaru would probably not do this) he is but one Essie against half a dozen.
In the end, I see this route leading to Orochimaru telling Hazou to go missing. It's the same calculus Orochimaru made fifteen years ago, after all. If there's no way to complete your research in Leaf, you have no choice but to leave Leaf. His protection is no true subsitute, I fear, for going missing, and I don't feel like it makes it all that much safer to get a head start and begin research before leaving. I would still, as things stand, want to refrain from that kind of research until we are reasonably sure we will be out of Leaf before anyone shows up to interrogate us.