Prax

Great, ordered one

hdmi dummy adapter, I don't know anything else

sudo apt remove dkms
 
wget http://imola.armbian.com/beta/pool/main/l/linux-5.10.110-rockchip-rk3588/linux-image-legacy-rockchip-rk3588_23.02.2_arm64.deb
sudo dpkg --force-all -i linux-image-legacy-rockchip-rk3588_23.02.2_arm64.deb
sudo reboot
sudo apt install waydroid
sudo waydroid init
 

I will try that tomorrow, thanks!

sudo apt install linux-image-legacy-rockchip-rk3588
 
If you build one yourself the debs will be in ./output/debs/
To install sudo apt install ./*image*.deb
or sudo dpkg -i *image*.deb

You could check the config of the installed kernel, if these modules were already enabled, then it won't help if you rebuild with that same config
nano /boot/config-5.10.110-rockchip-rk3588

I guess you need these kernel modules:
CONFIG_ANDROID_LOW_MEMORY_KILLER=n
CONFIG_ANDROID_BINDER_IPC=y
CONFIG_ANDROID_BINDERFS=y
CONFIG_ANDROID_BINDER_DEVICES="binder,hwbinder,vndbinder,anbox-binder,anbox-hwbinder,anbox-vndbinder"
 
These are in the config on github, probably you'll need to update the kernel