Can't keep FG alpha channel after BCCVR Insert node (FUSION)


Is there a way to keep the alpha channel from the FG image being inserted on top of a 360 video?

I think this is related to the fact that I can’t get my head around Lightwraps in 360 videos. I have greenscreen footage that needs to go on top of a pretty bright CG BG Latlong. But the greenscreen footage isn’t latlong, just plain 4K,how would you proceed?

Lightwrap when I apply it, just seems off, shifted to the sides, because (I think), I’m applying it using a latlong (BG) that bleeds into a rectilinear FG.