Touch screen rotation

After a lot of trial and error I managed to get my Pi4B up and running with a Waveshare HDMI 7.9 widescreen display... but two sticking points I'd like some help with if anyone has any ideas:

It won't boot at all without changing
dtoverlay=vc4-kms-v3d,cma-384
to
dtoverlay=vc4-fkms-v3d,cma-384

in the config.txt, but this gets reset after a reboot it seems. Is there some way to alter this in the config-overrides.txt?

Secondly - the touch detection is 180 degrees off from the screen. I've tried display_rotate=2 etc but no luck. Is there a solution for this?

Thanks in advance for any help.

Jon

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