From Anonymous Money we link to separate pages for:
For everything else we can say unsupported.
But I woulnd’t mind users talking to each other without Whonix team investigating much. For example monero in Whonix with torsocks for better stream isolation doesn’t have much support from Whonix team.
I don’t think I’d use any time for fanboiscoin or similar. I’d even not be interested to look much into Ethereum and Ledger Hardware Wallet at the moment either. But the current docs can stay as is in hope it’s useful to someone and in hope someone will improve them.
Mist - Ethereum integration Whonix 14 - #3 got the suggestion to sort it out as per free support principle. The related wiki page Ethereum - Whonix is already known by the user and it says unfinished in bold, capital letters. That page tells how to do it in principle but since tunneling UDP over Tor is required admittingly only advanced users can achieve it. So while that page is a stub it can be useful for advanced users.
In summary I am not seeing much of an issue currently and it looks to me that mostly/fully(?) your suggested policy is in place already.