I looked, and couldn't find a free monospace font with both OPEN BOX and CIRCLED LATIN CAPITAL LETTER T. Well, I exclude Unifont, because I don't think it is adequate for use in print. My search wasn't exhaustive; does anybody else know of one?
So you can substitute a space for something with .tr, but not something for a space? I did not expect that. Yes, I've run into applications that substitute leading spaces with NO-BREAK SPACE, and have been mystified why code cut and pasted from there doesn't work anymore, until I finally looked at the actual characters and found NO-BREAK SPACE instead of SPACE. -- T. Kurt Bond, tkurtb...@gmail.com, https://tkurtbond.github.io