I think we need to come up with a way to create a working group or interest group on accessibility, or get involved in an existing group. Because I think that simply asking for feedback from random people won't be enough.
Yes, and it'll have to involve as many Mastodon users as possible. This means that it'll have to be reasonably easy for Mastodon users to use without having to jump through hoops.
Setting up a Hubzilla forum and turning on ActivityPub is easy enough. It is compatible with Mastodon, and they can interact with the forum remotely via Mastodon if they wanted. That part is easy.
The tougher part is recruiting enough people who are interested in the topic so we have valuable discussions and recommendations.
If it's intuitive enough for Mastodon users who barely know the rest of the Fediverse by name to use a Hubzilla forum.
