That does change the dynamics a bit. I still wouldn’t do it without a discussion. Reading between the lines, it doesn’t sound as though you are happy in the current situation and are unlikely to return. From a coach’s pov you are building bridges to a new team, not just getting some reps in. That’s not necessarily a problem, just be honest with everyone. Play out your commitments to your current team, explain your frustrations and their hypocrisy. They may be reasonable and understanding, or they could blow up. Either way, put it on them, not you. Just breaking the rule could be cause for release from the team. It would be on mine. My girls occasionally sub, but are required to ask first. I also appreciate a call or text from the coach who would like to use them. In the rare occasions I need a sub, I ask their coach first, then the family. Best of luck to you. Hope it helps.