As someone who has tried (and failed) to mount the GE863 on my own board, I would love to see a compact breakout board for this module. It’s an expensive part to be experimenting with.
I would love to see the SIM holder mounted on the compact version too, even if it’s not populated by default, since it has high-frequency lines and the GE863 is not very forgiving. It wouldn’t affect the board size very much either.