I think it makes sense to use the GitHub issue tracker associated with the imagebuilder repos.

Make a pinned post in the software section. List all the models of the same hardware type then link the various imagebuilders and their associated issue trackers.

Something like:

Supported Model Software Version Firmware Links Notes
AR300M
AR300M-EXT
GL.iNet 2.27 GL.iNet NAND NAND Image Builder
NAND Issue Tracker
NAND Wiki
Latest Version
AR300M
AR300M-EXT
AR300M-LITE
GL.iNet 2.27 GL.iNet NOR NOR Image Builder
NOR Issue Tracker
NOR Wiki
Latest Version