What are Alternatives to basic ROT-n Ciphers which Don't Lose 'Context'?
Any letter (simple) substitution cipher will do (it might be necessary that it special-cases any character that your text-generating software special-cases, like space, tab, linefeed, perhaps punctuation).

ROT-n is a particular case of substitution cipher, with a much smaller key set (if we restrict to uppercase letters, ROT-n has $26&lt;2^5$ keys, versus $26!&gt;2^{88}$ keys for a general substitution cipher; that less than 5 bits versus more than 88).

Depending on what the text-generating software does, it might also work to substitute words, in addition to letters. That further increases the key space.

Substitution ciphers are hopelessly insecure, thus it is unclear what this achieves, or what is attempted.