Well, I hope that Kairos isn't feeling particularly spiteful at the moment, given that it seems we'll be pointing him in Nacretinei's direction.
That's my biggest objection to the current winning plan. The short sighted under-investment in industry and frankly pointless spending on partially building engine controls is annoying, but the unnecessary risk of the Scrying action, despite the introduction to that section being a huge health warning is the real problem.
Sure, this risk may not manifest, but the Webway is probably the easiest place for Kairos to exploit us tipping him off, and the winning plan is to do so not just once, but twice!
And worse, doing this despite us knowing that other Craftworlds who Kairos is much less likely to be focusing his spiteful attention on are also Scrying, and we can coordinate with them to find out what they learn.