Doubt it'd actually work - remember, humans.

I think the "random but actually meaningful" route is better. If you want it to get checked, grandma's name comes off fake name generator, not line noise from a CSPRNG.

You can't "outsmart" someone whose salary is predicated on doing the most frictionless version of the work possible and still get paid.

I just generate a short set of random words.

A CSR is much more likely to expect correct or similar words than a correct or similar string of gibberish.