Rectilinear Wide-Angle for Olympus w/ 12-50mm lens

Right now I've got an 8mm fisheye + small dome and 60mm, so I've got bendy wide angle and macro covered, but now I have my 12-50mm lens + the nauticam port with an M77 thread I used to use/may still use for macro. I'm missing a rectilinear wide angle option so best option seems to get a wet lens to convert. Options I know so far:

WWL-1 (if I could find one second-hand) screws straight onto an M67 so I guess I could use my flip diopter holder and not flip it? Not sure if there's a better M77 - > M67 conversion or if I need to do M77 -> bayonet -> M67. Limited to 14mm but the nauticam port already screws things up around there so not really an issue

WWL-1b: Integrated float collar so yay, I'd need a bayonet holder which seems to limit the zoom again to >16mm or thereabouts

WWL-C : Would work at the full 12mm end but again not really relevant so only benefit is cheaper + lighter?

I've seen this thread a few places and the consensus seems WWL-1b. Was wondering if I've missed any options; is the Marelux Aquista roughly the same thing? Do they accommodate M77 on their bayonet mounts?

I've also little interest in removing this underwater so not committed to the wet lens option but rectilinear m43 lenses don't come up often in conversation, not sure what the feelings are there.

Any and all advice is helpful!