You're fundamentally missing the point. The UK won't base its subs in Faslane post-independence. They'll be based in Kings Bay, Georgia in the short-term and then moved to a new base in the rUK.
The UK's Strategic Nuclear Deterrent being based outwith the UK is a complete non-starter.
Besides, why would we want it? We'd have no control over it and it would simply make us a target. No thanks.
We'll see. I get the feeling that the mood music in the EU27 is turning more towards an irritability at being held to ransom and a desire to get to a conclusion and to get on with their lives.