For cases like these I semi-seriously suggest using a keyboard with programmable macros. Usually people laugh it off but I think it's not the worst idea. Almost no one I know would know how to find and execute a macro on my keyboard, if they even considered looking for a password there.
I may have done this at an employer. You don't need a keyboard with programmable macros, though, just a way in the OS to setup a keyboard shortcut to run a command. In Linux it's super easy to make "super + x", or other modifiers + key, execute a bash program. That bash program can then use xdotools to type a password, generated and type a 2FA token, type a ¯\_(ツ)_/¯ string (because slack imagified the emoji version making it unreadable), whatever...
