I wouldn't necessarily assume that the "SCA Masonic group" would be the only ones interested in a Research Lodge.

Oh, none of this has anything to do with the SCA, save that a few of the key people are SCAdian. I suspect that the meeting-at-Cons thing won't happen except rarely, although that will probably depend on who is interested.

Should I post something to our group, to see if Masons are interested?

Sounds like a fine idea. Tell me if anyone is, and I'll dig out the relevant contact address...