Testing the Pianoteq binary, it actually has a headless mode & supports arm64.  It'll run in a container, export a .mid file to a 24 bit 48khz wav file.

It uses maraca samples to synthesize the damper noises.  Rapid pedal movements work & sound reasonable.  Gradual or half pedal is a failure.  It replays the same sample every time the damper value changes, like a shaking maraca.

Una corda just reduces the velocity codes the way an upright moves the hammers closer to the strings.  It doesn't perform any lowpass filtering or gain reduction like the CP33 & it's certainly not muting any of the strings.  The damper noise & una corda were basically the only reasons for trying Pianoteq.

The fact that no-one demos una corda or half pedaling doesn't bode well for any other windows tools.  They all demo the same jazz sounds.

There's still a way to reuse the pianoteq damper sound elsewhere.