perhaps I'm misunderstanding, but I believe the OP thinks he has to do an INTRO day before riding a full day.
not the case. Just sign up in "B" and go. Now that you've moved to a new part of the country, you're lucky enough to have all new (to you) tracks. "B" should actually accommodate that really well, and if you're lighting it up, you won't be in "B" long.
i saw a guy at beaveRun turning 1:04's in "B" group 2nd or 3rd session (I consider 1:10 to be a fast-ish "B" time on that track). He was in "I" before lunch.