In C++ you can use DOREPLIFETIME_CONDITION( AMySomething, MyVariable, COND_SkipOwner ); , obviously this isn’t a solution for you since you’re asking to have it in BP, but main point is the functionality exists already if they are willing to extend it to BP… however if you have a C++ parent class you could declare the variable there and use COND_SkipOwner.
It would be good if they could bring all the conditions to BP variables, I’m unsure why they haven’t.