Getting this to run initially was a little more difficult than simply running the stop_services script. Matchbox automatically restarts because of dsmetool settings. In order to prevent it from immediately restarting, editing of /etc/osso-af-init/nice-launch-wrapper-tryrestart.sh was required. On line 57:

/usr/sbin/dsmetool -n -1 -t "$CMD $PARAMS"
needs to be changed to
/usr/sbin/dsmetool -n -1 -o "$CMD $PARAMS"

...this tells dsmetool to only restart matchbox once, and after that allows it to be killed. So then I edit your script to add killall -9 matchbox-window-manager, and I can finally start Qtablet!

Also, I don't understand why the pager's screen is slightly bigger than the tablet's screen. The bottom row of icons in the pager are half off the screen.

So far, apps that work:
Terminal
DialCentral
Fring

Apps that don't:
MyTube