I really find the idea that "having to know, or lookup stuff", as a problem, offensive.
Laundry is literally filled with things to know, outside of these symbols. Household tasks are.
I don't see labels on bleech bottles, saying not to mix it with vinegar or you could die. Yet people have done that in the wash, so why not start there?
Here's what each sane person should do, who actually takes time to look at tags. (after all if you couldn't care less, and never look at tags, what's the point?)
Print a copy of the extended tag list out, and hang it in the laundry room at home. I have a cabinet where I keep extra detergent, etc, so I taped it up on the inside of the door.
Problem sovled.
For a laundrymat, for your smartphone, download a properly formatted, for easy phone viewing version.
Done.
Non-problem, compared to expecting the entire planet to change. We don't need another standard!!
All that would happen is I'd have two standards to look at.