Here's my unsolicited 0.02 USD.
Rename the Groups.io group to "bitx" (this is possible through the settings i think), create subgroups for each radio in the bitx family (bitx20, bitx40, ubitx, etc), and perhaps another subgroup for the Raduino and programming issues. There will still be a "main" group which could be used for announcements or general discussion, but subgroups would allow for users to subscribe to what interests them.
The wiki could very easily become the official bitx knowledge base, but it needs some TLC to get to that point.
Unofficial bitx chatroom: https://discord.gg/CrHvWFc