Thanks @mobileoverlord, I have been using the example app as reference, and the screen does work well by default!

My problem is operating the display vertically, I need to rotate the touch input.
I have come up with a solution that seems to work, albeit does not perform as well as the monitor in its default orientation…

I am running the following before launching the WebengineKiosk

 :os.cmd('udevd -d')
 :os.cmd('udevadm trigger --type=subsystems --action=add')
 :os.cmd('udevadm trigger --type=devices --action=add')
 :os.cmd('udevadm settle --timeout=30')

 System.put_env("QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS", "/dev/input/event0:rotate=270")
 System.put_env("QTWEBENGINE_CHROMIUM_FLAGS", "--disable-gpu")

QT_QPA_EGLFS_ROTATION

actually just rotates the display but has no impact on touch input, -90 is what i need based on the orientation of my display - might be able to rotate the display normally and just leverage the next step…

Rotating the display via config.txt - and tweaking the below parameter seems to have worked well!
This is the solution! woo QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS

event0 is the device name for my touch screen events, and setting rotate=270 gets the touch input oriented as needed

When not messing with the orientation and just having udevd enabled, the touch screen works very well. Things like swiping to scroll, and pinch to zoom are accurate. after tweaking the settings as above those functions are a bit shaky and the touch does not seem as responsive.

Here is a link to the relevant QT documentation: