Is my bathroom wet-venting plan reasonable?
All of these layouts look good. The venting should be fine. You're connecting the lines with wyes, not tees, which is good. 45° Bends in the 3&quot; cleanout line should be fine; a snake will easily make the turn.
Altogether, it looks like you've put a lot of thought into this. My one recommendation would be to check your state venting code to see the maximum distance allowed between a drain and its vent, just to make sure everything is close enough. I don't foresee a problem, but it doesn't hurt to check.