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There is a thread with a guy integrating a cm carrier board with a 7c81.
The RPi5 works but it's a very expensive option compared to an ex corporate PC. The only real advantage is size and that's about it. The RPi5 images work out of the box, but do require the zram fix mentioned in the big thread, it's not a game killer but can raise its head.
Having a RPi5 and 3rd Gen I5 running for testbeds the i5 is definitely the one I'd choose for a build.
For my mill I running a odroid H3 and can not fault it, this has been replaced by the H4.
As for pre-built control boxes, any that rely on the parallel port can be used with a 7i92 for an ethernet option or a 7c81 for SPI with a Raspberry Pi. Some of the issues I have with them is use of DB9 connectors for the Stepper motor connectors. Most of them are quite compact which raises issues of heat and airflow.
I prefer to build my own, lots of room for air flow, the ability to keep the mains and signal wiring well seperated, on side has all the mains, the other side has the low voltage signalling.
I guess if that isn't part of your skill set then an off the shelf control box might be the option if you have the funds.

Thank you for your answer! I like to dream big sometimes Of course having this for sale as a bundle would be epic, but even if I just managed to make a github repo with the whole config + BOM + CAD model of the control cabinet, I think that'd still be really helpful, right? Also, is Raspberry Pi really so bad for this goal? What are the disadvantages? I thought it's a pretty nice option given that it's quite compact and rugged.