If anyone were trying to intercept that document in order to steal passwords, the font would have absolutely no bearing on their ability to find the password. In plaintext (ie: document opened in Sublime, or other plaintext editor) the password would be very obvious. And even if the interceptor didn't open it in plaintext, it would be incredibly easy for them to just... change the font.
Using a "password" font would only decrease the likelihood of someone reading the password over your shoulder. I guess that has value, but I think you'd be way better off finding a real encryption solution.
My coworkers and I use Keybase for sending secure info back and forth. The UI there is super simple for people that don't actually understand PGP, but it's (almost) just as secure. You could even do something simple like `keybase decrypt password.txt | pbcopy` on a mac, and that would take the encrypted text and put it in your clipboard - it would never show the password on your screen in plaintext.