I have a main mac desktop, and "uploaded" my macbook into proxmox near the start of the pandemic. I just use mac to mac screen sharing to get to it and it works wonderfully.
If you don't know, screen sharing is done very well - it does very intelligent things, such as drag and drop files from desktop to desktop or rich-text copy/paste between systems. It will also pass keys correctly, so command-q will quit a remote app instead of quitting the screen sharing app itself. same with alt-tab.
I used to use screen sharing with the macbook itself, but it kept going to sleep with the lid closed at inopportune times even with caffeinate, so I just cut to the chase.
I also was able to migrate the macos vm when I upgraded my proxmox machine hardware. "vzdump ", copy the dumpfile, "qmrestore ", voila