Personally, I would suggest to not even run a Desktop Environment, certainly not on a true IoT device. What GUI software do you plan to run? Are you aware that you can do that X can forward a GUI over ssh for you? Let's say you wanted to run blender and display the output at home or in your office on your shiny 27-inch, curved 4K display. OK. First, install a browser on the IoT device "sudo apt install blender". Secondly, make sure X Forwarding is enabled on the IoT device "sudo grep X11Forwarding /etc/ssh/sshd_config" and make sure it is set to yes. Then, you should be having no problem to get blender to run on your IoT device but the GUI window will show on your large display with "ssh -X $IP-of-your-IoT-device", run this of course from your beefy machine. This works just the same for any other software you want to run remotely.

Have you tried to ask this in our discord server?

I'm sorry, but I don't see where the problem is. Please be more specific.

it would be good to have those logs for a non-working setup.

awesome, well done! and thank you for sharing.