I don't see, why bathrooms are separated at all. Just plan more room for cabins and maybe one separated space for standing toilets out of view.
After all at least here the men's cabins are often used by women, if the line is too long. And since the cabin is already private, who cares?

I would guess 90% or more of the people using ogham, are probably tom Scott fans, or am I wrong?

He even cares enough to be able to give them away, if other rescues have better facilities.
It's probably pretty hard, even if you know it is the better option.