I'm a bit confused. Would you mind clarifying whether you think using "crutch" is the more clear vocabulary, or whether alternative vocabulary would be more clear?
To be clear, version a is referring to literal (non-metaphorical) crutches, and is not the version being used here because GLP-1 agonists are not literal crutches. Version b is the only possible use of the word being used in this conversation, and is always pejorative. "Oh, you broke your foot, you're getting around on a crutch" = Always version A, literal, non-pejorative. "Oh, you're obese, you're using medicine as a crutch to cure it" = Always version B, metaphorical, pejorative. There's no confusion.
It might be more good faith to just pick language that is more clear. The alternative feels a lot like pretending to be one thing while trying to make people think something else - it rings just like a bad faith "Im just asking questions"