Strictly DOS only PCs were more of an 80s thing; by the 90s, every DOS machine also had win3.x. It existed alongside DOS and you’d switch between them regularly depending on your programs. It wasn’t really until win9x that you were expected to boot into and stay strictly in windows, even running DOS programs in the virtual DOS environment.
For this reason, i think win3.x is fair game for DOS era discussion, in a way that 9x isn’t. Also, there are just relatively fewer big tentpole games that require win3.x anyway. If the club did like 1 per year I think that would be fine.