After using the bathroom for a week while on the road, my wife and I agree that it definitely needs to be looked at for a modification. The clingy shower curtain is obnoxious.
One idea is to remove the sink vanity completely and install a bigger shower surround with built in framed doors. I would take a tip up sink from a class b and put it over the toilet. Pretty common set up.
Another idea is to move the vanity over one inch. Put in a square sink vessel. I would build a custom vanity to match that is higher with slide drawers to maximize space. Moving it over one inch may give me enough room to install framed plexiglass doors. I would definitely mock this up beforehand to see if it could work.
My first option will probably be extending the arc to see how that works. However, the sink and vanity definitely need to be swapped out.
Keep us posted on the over arching shower arch. Need some real empirical feedback. Sometimes the best solutions are the simplest solution.
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