I did a bit of research, you can get HB4 adaptors to H2, but not the other way around.
I found a pair of second hand stock headlamps that I've ordered. I have a pain in the a** with these headlamps now. Ironically if I go back to stock, I can swap in and out HIDs much easier than these which are made specifically for HIDs (H2 is the "native" HID socket type). I currently have to remove the whole unit to swap them around.
It means going back to the yellow indicator lens which is slightly less cool than the full sliver look of these ones, but I don't care at this stage!