Once again, thank you @dk1978 for all the effort!
I’ve been using LOS 17.1 for microG since it got available (around the 10th of january).
So far it’s very stable 
There are a few issues I wanted to share (although the first one is related to Magisk/rooting):
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When FP3 is rooted, sometimes while using calling function, either with Signal/WhatsApp or if you’re trying to call someone directly after that over the normal cellular network, the whole OS is crashing. The display goes black and I always have to force it to boot into bootloader (Power button + Vol. down button) to start the OS from there.
Until now, this behaviour never occured without root. -
One issue that was already mentioned here is the Night Light that doesn’t work for me either.
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If VoLTE is activated, I still can’t see the name/number of the caller (“Unknown number/caller”). This issue exists since I upgraded my FP3 to Android 10 (original OS) but seems to be solved in the meantime or at least no occuring that much since the 0066 update.
This issue and some ghost touches that are occuring lately (which seem to be fixed with the latest 0077 update) leads me to the question wheter you’re planning to integrate those (i guess) firmware files or not? Or do we have to patch them seperately?