I would like to use a terminable upgradability pattern for an upgradable contract. By that I mean I want to be able to provably end the ability for the contract to be modified after a certain point.
I was thinking the best way to do this would be to self destruct or “seal” the ProxyAdmin so that it can no longer change the implementation address. I have having trouble figuring out how to change the ProxyAdmin implementation using the truffle-upgrades plugin, though. Is this a reasonable approach?