We used to use IBM Selectric typewriters in the lab for that all the time after we finished assignments. That’s why it occurred to me.
Anyway:
Nevertheless, spaces are part of fonts, and can be used in passwords. “Aka unicode U+2423” isn’t the same character as a space (U+0020), as amply demonstrated by…pretty much everywhere, really.
But since you bring it up, if one can employ a different character to reduce a point of ambiguity, then do you think they could employ a different font?