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I'll contribute my small data point after staring this thread way back when.
I eventually gutted my original sunroof, did some hammer and dolly work to the roof side flanges, and bonded the original sunroof panel in place.
My reasoning was pretty simple: I was afraid of warping the roof or sunroof panel with too much heat.
The bonded in panel worked perfectly, with very little bodywork required, and almost no filler. I'm very happy with the results, especially the increased headroom. I've only put a few hundred miles on the car before winter set in, but I have no reason to believe any cracking of the filler or witness marks will come back to haunt me.
With the pre-formed panel that you have, I would not hesitate to bond it in place. I expect this to be even easier than my re-use of the sunroof center panel and the end result should require very minimal filler.
Vin
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