That’s likely the most practical way to get civilian versions of the Ghostbusters, pack less-popular civilian outfits with must-have big ghosts. Though what non-standard varients of Egon, Peter and Ray are comparable to Winston’s Jaguars attire?
I suppose you could either have “fanboy” or “rockstar” Peter to go along with Shanna (human form), Werechicken Egon with the regular Werechicken? Hoppy the Boot Bunny Ray with either the winged puma or one of the ghosts from Elaine’s house would’ve been the option, had we not already got Hoppy’s bunny ears with standard-release Ray.
At the moment though, I think we’d be more likely to see the guys in their regular civilian gear (with maybe Winston having either a Jaguars baseball cap accessory, or a head with the baseball cap permanently attached).