I have a really weird workaround to use remote desktop while display is off. If I set my monitor to an invalid input (ie. my desktop uses Displayport and I set HDMI on the monitor) and let it shutdown automatically due to no signal, it remains “connected”. So I log in to KDE Plasma, let sunshine autostart, set an invalid input on the monitor then I can remote into my desktop whenever I want using moonlight, while display remains off. This can be combined with tailscale and even with Wake on LAN by enabling SDDM autologin.
Anything but sunshine is not usable when not on the local network, I experience massive latency.
Ironically moonlight is my soft blocker regarding wayland, I rarely remote while I use touchpad gestures regularly so I stay on wayland.