Hello Mike.
Thanks for the post. I don't need this sort of thing for myself because I irrigate so do not have any output during the day, which means I can shower without any protection. However, my reply to your post in more to express my appreciation for your experimentation.
When someone mentions a problem they are having, I like to experiment with trying to find a solution even if I don't really need to. I have a whole collection of odd devices and gadgets that I've tried over the years. Some work better than others but I've come to the conclusion that many of these things would need to be custom-made to fit the individual as I often need to tweek a prototype several times before it 'fits'.
I would encourage everyone to have a go at experimenting for themselves with almost anything that is posing them a problem. It's great fun once you get into the mindset of DIY, rather than relying entirely on manufacturers to invent stuff for us.
Best wishes
Bill