Very fascinating. I haven't really thought it through, but figured this would be a good plug for my Bitcoin math primer and Bitcoin math puzzle series of posts. To evaluate the incentives for quantum labs to partner with miners, and to not mine on top of each others' blocks, requires models of miner strategic behavior, and they need to be stateful models where action depends on things like how long each miner's private chain is, how many coins they've stolen via quantum, etc.

My first instinct though, is that if this war was to break out, the effect on bitcoin's viability would be way worse than if just a single quantum attacker stole a bunch of coins. So you are offering a stronger argument for confiscating quantum-vulnerable coins than the standard argument.

This is my best steel (steal?) man argument on why we should freeze the coins.

"Steelman" is correct. Like, you're building a man made of steel. It's the opposite of "strawman".