I use AnySoftKeyboard. Multi language (as far as I know) customizable, recommended by privacy people, has a lot of the non-alphabetical characters under long-press on the main keyboard (or you swipe or press the button to reveal them)
I have two domain names. One goes to anonaddy and I use that for all non-important stuff. Maillinglists (for discount), orders on a sketchy site, signingup for social media.
The other ends up at protonmail and is for more serious stuff I don't want to route via anonaddy (while I trust the developer and the service, I just want extra safety). I use aliases at protonmail as well to know where stuff comes from.
Deciding which domain to use depends on a couple of things:
what happens if they access my mail. Is there a payment option connected, can they get into other services or request stuff from the government? If yes, chances are I go with the proton route.
do I expect a lot of advertisement, selling of my data or security breaches? If yes, I go with the anonaddy route.
For amazon I use the anonaddy route. I do not add my creditcard or bank account to my account and if they do gain access, they will only get my email.
Why would they even want to do this? And why would the drivers agree? It's personal information I wouldn't want the world to know.