There was one official tie-ins involving a post-Mindwarp Peri that I'm aware of. The Age of Chaos, a one-shot comic by Colin Baker(!!) suggests that the Doctor made regular visits to Thoros Alpha to see how Peri was doing. The story is mostly about Peri and Yrcanos's grandchildren, so Colin saw the match as a permenent one.
(Personally, I'm with you; it's about as likely as, er, squeaky-clean Mel going off with a career criminal...)
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(Personally, I'm with you; it's about as likely as, er, squeaky-clean Mel going off with a career criminal...)