I don't know why restrooms are so fucking hard.
Solution for restroom problems via politics when your business doesn't have the funds/space to redo it:
1. Put up a Round Bathroom sign with a man, woman, child inside it on all restrooms. If people seem confused, a nameplate that says "Unisex Bathroom" should straighten it up. If not, you got smart customers.
2. Install a door lock (one sided with a service pin release in case someone locks themselves in and doesn't respond), and sufficient amenities for any biological need for anyone at any age.
3. There is no step 3.
Men who need to go and the traditional 'Men's Room' being occupied can simply use the other one. Women don't need to rush while using an empty men's room in fear that a man is waiting when she's through. If there's baby stations, any bathroom can be a family bathroom if you lock the door. Bathroom has a tampon dispenser and a 'men can' next to your toilet? If you don't have the associated parts, simply ignore them.