As stated I would like to join the crew as a subscriber and be able to race on both platforms Ps4, Xb1. Will my subscription be valid for both consoles, so I'll be invited whatever console I'm on at the time?
Nonchalant Dominance and its forums are completely unrelated to the 1322 crew and stream races. For your questions you need to join the 1322 discord and go the the help-and-support chat. But to quickly answer your question, yes you can join on both consoles.