I support the opinion to be inclusive, regarding the accordina , as it is a sidekick or second instrument to some CBA accordion players. And not only in France, the accordina is going worldwide (eg Asia).
Moreover there are some commone elements in the playing techniques for accordina with chromatic button accordions.
It's true the accordina misses the bellows, so I agree the topic could be transferred to another section of the forum, eg the pub or a free reed family section.
But it would be not effective to create a whole new "accordina forum" website.
Eg if persons like me who's interested in all sorts of free reed music instruments, have to become a members of all the separate forums, like an accordion forum, melodeon forum, concertina forum , harmonium forum, mouth harp forum, accordina forum, bandoneon forum, steirisch harmonika forum, ... I could name many more.
.. this is a lot of work...
I agree, the accordina isn't the core business of an accordion forum.
But one should be carefull not to be too exclusive, otherwise you have to start defining "accordion".
For instance, there are many hybrids in the accordion family.
Where would you classify the "gaita ponto", the "Jimmy shand accordion", the bisonoric accordions with a unisonoric bass or vice versa, unisonoric accordions with a bisonoric bass. Would you exclude them here, and direct these to the melodeon forum?
The melodeon family also has many hybrids in it's family.
The accordion history is packed with the creation of hybrids.
And strictly speaking, an accordion does not need bellows. There are many types of "Blasakkordeons", only mouth blown "melodicas" with 2 or more basses.
You could look for arguments like the accordina is a bit of a "free bass CBA mouth blown free bass... accordion", but you'll have to form the chords yourself, just as on a "free bass accordion".
A "free bass accordion" is it an accordion (with prefixed chords) or not?