I think your goal should be to install the sunroof glass so it sits flush, has a good sunroof seal for wind noise, and drains rainwater properly which means removing the A-pillar trim and straightening out and securing the front sunroof drain hoses.

Then pull fuse 58 and don’t plan on using it.

The E53 pano sunroof is, in my opinion, a horrible design with way too much plastic and too many pieces. It’s far too complex and does not age well.
Sure you can fix it and get it to work, but it will likely break again. The early non-pano sunroofs, likely borrowed from the E39, are much better.

I love my E39 sunroof and wish my E53 had the same unit.

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'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
'05 X5 3.0 auto 173k-SOLD
'03 530i - manual swapped - 430k miles-SOLD