And that does seem to work.
I still need to investigate whether there’s an easy way to set up one-time, limited-lifespan userIDs for this purpose. I don’t know enough about mail routing.
Though frankly, most such things get replied to with something like not-a-chance@heck.bozo – I’m willing to submit the vote, but since the odds of winning are negligible there’s no good reason to encourage them to contact me.