DVW,
First, welcome to the forum,
Now, I cannot help you find a glass enclosure, and maybe you have already tried this, but
In our TT (prior unit, owned for 14 years) we had a home shower curtain as well. Had a decorative one on the outside of the tub, had the ole plastic one on the inside of the tub. We had a seat in the tub, so part of that shower curtain was WAYYYY long! I cut off the portion that went around the seat area. I also took velcro and put on the inside of the tub and the matching side of the shower curtain. I did not let this portion of the curtain "fold", I kept it rather flat. The velcro kept that portion of the curtain in place for 14 years! And, kept the water IN the tub!
Good luck on finding a solution to your dilemna, and again, welcome to the forum!
Carol