Might be somewhat hard to do. The Jetstreams use PSM for their main maint base. That is their only maint base. They have nowhere else to go.
As for the 727s, if they ever get them going again (only 1 in operation now), that would be easier to do. Most of the maint folks/support/rampers, etc have been laid off. I'm told Sanford FL is barely staffed for anything.
I thinks they (BMA) are waiting for the Court of Appeals ruling on the ALPO lawsuit that imposed an injunction on them (BMA). I have no idea what timetable that may be; but I can tell you BMA is not much thought of in a favorable way in the Portsmouth, area. Travel agents in the area scoff at them; the general public is in no mood to re-book on them either. They are losing a lot of potential FL traffic this season by not flying.
But, it was their choice.