My mistake, should not have been editing files in /usr/
so instead run
sudo nano /etc/sddm.conf
Then add the following to the beginning of the file.
[General]
InputMethod=qtvirtualkeyboard
Modified my own files to match this, everything working fine.
Edit: Should also point out that these settings only seem to work for Wayland, switching to X11 stops both touch keyboards. Not looked into a solution for X11 as I only use Wayland.