As I've said before, I am relatively confident that the prohibition refers to replicating the
mechanism of a failure, rather than replicating its
effects. The Rift was the result of a sealing failure - not even a minor one! - and we've been happy to mess with that. Reality Eaters are an interesting counterpoint as another example of a failure-inspired seal/rune, but given that PLTRs are more distant from the original effect (e.g. fixed speedup) and take inspiration from a minor failure rather than a major one, I think Hazōpilot is unlikely to just veto them. (Also, Reality Eaters may have been just that Hazō had no idea how to achieve the effect any other way without actually trying to figure out how the seal failed and make a seal that does that on purpose, which is the suicidal thing.)
That said, I agree that if PLTR 125 comes back "Hard" it's probably not worth further investigation (obviously unless there are caveats like "Hazō thinks this would be much easier at a higher speedup rate"). Barring such caveats, the course of action I think would be wise after each possible result is:
- Trivial: difficulty check higher-speedup PLTRs until we find one that's Easy, then research that.
- Easy: research ASAP, on the same priority tier as Remote Explosives.
- Bear in mind that it may not be safe to go into a TR with a PLTR speedup on you, in which case don't use it until after researching the Temporal Normalization Rune (preferably a continuous or reusable version).
- Medium: put in the queue for research, but relatively low priority.
- PLTR 125 would be extremely powerful (extra Supplemental every turn plus an unknown numerical bonus is my guess) but probably not battle-winning by itself, and if we use it against Akatsuki it leaks to Oro that time manipulation is possible (if he hasn't already thought of it). It's the higher speedups that would really be game-changers, and we've already got lots of less fraught runes in our Medium-tier queue.
- Hard: abandon line of research.