Alright, commence the hole poking.
lol, as tin-foily as that idea is, it's a little bit too impossible to work. The whole idea of shifting hexes would be something that hasn't even been hinted at in the comic, not to mention the fact that if that were possible in Book One, Stanley wouldn't have fled from Gobwin Knob; he would've just had the capital transported to where the FAQ cities were located.
If Parson (or Ansom) had known about it, they would've used it on Gobwin Knob's last turn, rather than using their massive force of fliers. Or, you know, if that were possible in any way/shape/form, it'd be the only way of waging war in Erfworld:
Step 1 - Build up in your city
Step 2 - Teleport your massive army into your enemy's capital
Step 3 - ???
Step 4 - Profit!
Not to turn into PlotArmor or anything, but if that were the solution to the entire build up of the book, I'd probably be the first to cry "Du Ex Machina".
I'm not trying to be harsh or anything, but it's just as likely as the theory that "Parson lets himself be captured by Jetstone/turns to Jetstone and walks the entire way there", or "Sizemore tunnels under a few hundred hexes in a single turn and reinforcements emerge directly underneath Spacerock"... Both, although clever ideas, have had zero foreshadowing and strike me as poor writing, rather than the smooth literary devices we've been shown in the comic thus-far.
Not to say that those ideas wont happen, but I'll be more than upset if Parson uses a tactic which could've been used on their previous turn with equal/greater results. Whatever Parson is going to do, it needs to be something which will place himself (possibly the same for Sizemore/Maggie) in serious danger, doing something which no one else has ever thought of/been able to do before.
In my opinion, it's as simple as that... I gotta say though, I like how you think!