From my point of view, I don't think I would allow an amalgamation to be disrupted after finalized. They are technically one entity, and it would be a pain after a couple dozen turns to split them up.
But doing it during the process - hey, all is fair in love and SF.
A place where the SM earns their free pizza.
Oh, that just reeks.
My players expect me to pick up the tab when we order pizza.
Of course, if I try to convince the wife and kids to pay...
Ah, I'll just pay for it...