AJKW
Why do they need to be vaccinated in order for your vaccine to be effective?
Why do they need to wear a mask if your mask is effective?
If the vaccine is a touchy subject don’t discuss it, but don’t force your willingness to accept an unlicensed vaccine onto them.
She's not forcing. She's considering withdrawing HER company.
As the OP said, her husband is extremely clinically vulnerable. Are people in that category to have anti vaxxers forced into their company, possibly carrying a virus that is very dangerous, potentially deathly, to the ECV person?
Don't be vaccinated if you don't want to AJKW, but don't force your risky behaviour on the rest of us.