I know "transliterator" isn't the right word for this. If you know a better one, please comment it! Press space or tap/click the screen, then enter the text you want to have changed into monospace into the popup. Unfortunately, these characters can't be used in Scratch. Except for punctuation, you just get a bunch of question marks.
I made this project because I wanted to use monospace in a format that didn't allow me to use different actual fonts. I made this in about 20-30 minutes!* *With a few minutes of tweaking and tuning later. Update Log: 04/29/2020: First version released! 05/04/2020: May the Fourth be with you! Changed a bit of the user interface.