I will continue to disagree with your one size fits all prescription. It would be trivial to allow an antibody test in lieu of vaccination.
Responding to your edit: I already answered the original question. Allow an antibody test to prove immunity. Stop demanding vax as if it's the only way to acquire immunity.
It's quite funny to me how presumptuous covid vaxx advocates are. They seem to be saying, "you're going to have to relent eventually. What do I need to say to speed that up?". As if there aren't people who will listen to what they have to say yet continue to refuse and have perfectly valid reasons to do so.