I just started building a MPCNC, so I still have time to change one thing or the other, so I'll give your post a good read. Thanks for taking the time to write everything up.

In the German community Estlcam [0] seems to be used a lot. With a 50€ price tag it seems quite reasonable and it might be a nice piece of software to try out.

[0] https://www.estlcam.de/