My grandma eats sweets including homemade pies with 1-2 c sugar per pie, loves sweets in general, eats too many fried foods for my taste, doesn’t eat paint chips, bathes in a porcelain tub, and was JUST moved to a nursing facility this year since she’s losing her mobility (mind is still intact) and in another month she will be celebrating her 100th birthday. You don’t have to live in a bubble to live a long life. Much of your life expectancy is predetermined in large part by genetics. Use common sense and don’t lick the bathtub.

Does the joint where the glass wall tile meets the deck need a special glass molding? I would prefer none just glass tile to solid surface. You can run the wall tile right to the tub deck, and caulk the intersection with color and texture matched caulk. Borders/liners are added for aesthetic and transitional interest. Sometimes it's purely design, sometimes for function, sometimes a combination. If your glass tile can stand on its own, and you'd prefer it to do so, then let it. I've not ever seen a glass grab bar or hand rail. Clear polycarbonate (I think it was PC) yes, but glass, no. Mongo

Ameriwall has a tub surround with a 72" back wall. It can be cut down for a smaller tub. Might be others, that's the first one I found. 7230TA

Cultured marble or Swanstone solid surface (expensive) tub walls. Really, tile surround for tub is one of the easiest DIY. It is also one of the most affordable tile jobs to hire out. Alternative Sterling Bath/Shower 18 high, 58 gal, 13 1/8 depth. Here is a link that might be useful: Sterling Accord Bath/Shower