[racket] Changing at-expressions to other-glyph-expressions

New to Racket & Scribble. I specialize in dumb questions.

I'm looking at using Scribble/text as a preprocessor for a lot of files
that happen to have a lot of @ signs in them. So either I need to escape
the @ signs programmatically (hm, could be done, but could also be error
prone). Or, as I gather from the Racket docs, I can make a custom reader
for scribble so that it uses some other glyph as the delimiter.

I'm not afraid to do the heavy lifting. But this seems like a simple +
common enough need that I thought I'd ask whether it has a simple solution
before I started reinventing wheels.

Thank you.

Matthew Butterick
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