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Your could just upgrade Bookworm  to Trixie with sudo apt dist-upgrade for testing

Use a Meanwell power supply. Say a MDR-15-5 which is 2.4 amps

I've been playing with pi-gen.....I think it is a little better, you get a more raspberry pi like experience. There's a link in my proposal thread. ATM the moment I've been building upto the "lite" stage burning & booting and installing the desktop,Xorg and the rest. Linuxcnc has been from the debian repo.....But I should be able to fine tune things.

Bookworm has been the target so far, Trixie shouldn't be an issue, but one thing I really need to know is the status of linuxcnc.org/docs/2.9/html/drivers/hal_gpio.html . I think there was an issue with the libgpiod library.
Bookworm version is 1.6.3-1
Trixie version is 2.2.1-2

You can burn to your boot device sing RPI-Imager and edit settings such via the imager.

There's realtime kernels available via the raspberry kernel repo. The Rpi4 4k page kernels run on the Rpi5.......so we may only need one image to cover both boards.

win32diskimager was my go to for years but it has let me down with later versions. I recommend you use Balena Etcher which is available for Windows, Linux and Mac.

I discussed its use in my latest video