qk4-li3 Not sure if this is what you want to do but this is what I did on Plasma Wayland to use Maliit keyboard.
I ran the following commands to install Maliit virtual keyboard and enable the built-in QT Virtual Keyboard to be available at log-on.
sudo eopkg install maliit-keyboard
echo "[General]" | sudo tee -a /etc/sddm.conf
echo "InputMethod=qtvirtualkeyboard" | sudo tee -a /etc/sddm.conf
Enabled Maliit from System Settings
System Settings>Keyboard>Virtual Keyboard. Then select Maliit