FP4 - gcam-port

Does anyone use one of the mentioned GCam ports under CalyxOS?

What has to be done exactly, when I don’t have (and don’t want) install Google Services (nor microg)?

I understand that there are some open bugs to fix by Fairphone so that e.g. all 48MPixel can be used as well as all lenses (wide angle camera is missing right now) etc. - Camera & Camera2 API - missing features & bugs

But which port should finally be used and how to set it up?

I saw and tried:

No matter which one I tried it directly crashes after the start.