[emmelaich]

An guy my in-laws know can do this as a party trick.

Just talk on and on without using that char.

[nebabyte]

And why not? Can trivially construct a toolbox of known-good variants of 'standard' words, and think of synonyms for nonstandard words as you go, to string into minimal-but-functional-communication.

Simply a function of your... uh, surplus chronological units.