Swype is the best method if don't have individual key feedback IMO. I find it's generally pretty good at figuring out what I'm trying to say, and in the odd case it doesn't I'm usually spelling something wrong, or using a word I almost never use. And then, typing individual letters every once in a while isn't the end of the world.
The powder coat is the enamel. It's a ceramic powder that's sprayed on and then cooked in a furnace.
You have etched it. That, I am sorry to say, is permanent. If you have access to a furnace you could try refiring it, a few minutes at 1500 f would do it, if it can be done at all. You've basically turned a smooth glass layer in to a kind of sponge. You need to melt that outer surface again.
I've done it.
I am happier. Literally one of the best decisions I've ever made.