Graphene based cryptos are far more capable of implementing hardfork/mandatory changes than BTC
With the exception that you need stakeholder approval, after that you need witnesses and proxies to play along, if witnesses do not play with you, they need to be changed.
to make it short: I can barely see this passing stakeholder voting stage.
Why do you believe this kind of a change (enabling the snapshot/sharedrop of an UIA against an external crypto) would not pass the stakeholder voting stage?