The airport is not relevant at all, assuming it has a Docking system, of course. As I've said, the CRJ type is recognized since GSX was released, but we only had the Wilco/Feelthere model to test it at that time.
If the Aerosoft CRJ has a proper atc model set, or (failing that) a title that contains some pattern that would allow GSX to recognize it as a CRJ-900, I cannot see any reasons why it would work with the Wilco/Feelthere planes, but not with the Aerosoft one.
In any case, I've got a copy of the CRJ courtesy of Aerosoft so, we'll surely check it. Please allow some time, because right now most of the GSX guys are on vacation for the next 2 weeks.