But then Eq and Cab would apply to all stacks. What the OP wants to achieve is to have let's say 5 different sets of rigs with 5 different stacks and the changes applies only to the selected stack, not to the other 4.
I thought he meant the other way round.
Either way, you can do this with a bit of locking logic very easily. Additionally, the adaption of _all_ rigs for a gig to the venue shouldn't be done in the stack but in the output section.
Timo