Is there a list of which older win32 applications run under Odin?
Probably not. At the moment and in general, excluding hardware-related software, I'd only care about Firefox 87.0.4, Acrobat Reader 42, Office 201x, Flash 33, and perhaps a rare Java 8-based route app. Typically the problem will be reversed: use OS/2 when possible, and Windows when you have to. There's probably no demand for an OS which can somehow execute 80% of your 32-bit software and 0% of your 64-bit software, so compiling a catalogue for a few users has no point. I hardly have any important 16-bit or 32-bit Windows software, so I hardly have Win32-apps I'd wish were available for OS/2.
Most of the time my copy of Windows will be rather busy with updates, and I certainly don't want support for that. Microsoft tends to scan your disks quite frequently, one of their enforced harddisk-torture commercial coffee breaks, which (a.o.) indicates that it's even hard for Microsoft to keep up with new versions or new software, and so on.
For a small community it'll be more important to compile a list of (all) (legacy) software which works fine with ArcaOS, including DOS sound and old Windows apps, to attract new users. As opposed to telling 'em to download and install DOSBox for Windows, for example.