Home Assistant Developer Agner have worked on Vim3 port and have pushed it to Dev branch of official Home Assistant Git.
I have just built it from their git branch and publishing it here so users can try it out and give feedback. With Official Release of HASS OS 7 Khadas Vim3 image will be available directly from Hass team.
I recently bought the VIM4 with hopes to use it with home assistant. I attempted to use the vim3 image already created but didn’t seem to do anything. Has anyone else with a VIM4 try been able to? I know they are new, what would be required to make a new bootable image ( from https://github.com/home-assistant/operating-system/releases/ )
For a bootable image you will have to wait for mainline uboot and mainline linux kernel which might take long time given how new the A311D2 soc is.
You can always try the solution provided by @hyphop above.
Use khadas official ubuntu image and install home assistant on it. Using docker version will give you supervisor access too so it will be the same as Hass OS.