Update: I was able to get the “stripped” screw out using another Pentalobe-2 screwdriver bit from another company. It seems it wasn’t the screw, but the screw driver that was actually stripped. Hence why the other screwdriver kit I got came with 3 of this bit, I suppose.
Same issue for me too, how do I get the stripped screw out?
Did you ever find out or do the repair? I’m hoping to do a similar procedure: using a 2015 logic board to repair the 2017 macbook.
The problem is most likely a disconnected or damaged temperature sensor, I had this problem when reassembling a 2007 Mac mini. It can't read the temperature, so assumes the worst and sets the fan to maximum.