The wtbts is the master of evading the difficult questions. You have learned from them, so evade the hell out of them. Worked for me. Whenever the hounders came I'd talk about work, pets, family, ask about their families etc, and when they'd say, everyone miss you at the hall I'd just say, ' yeah well...' And move on, or say, "people at the hall know my address and have my phone number so if they miss me they know where to find me."
Don't mention doubts or ttatt, especially if there are two of them. Evade anything they say to lead you into that sort of discussion. Don't answer the gb question. I refused to answer it so they couldn't do anything. When the term 'apostate' came to the lips of one hounder I told him I'd been christened Anglican so was an apostate Anglican. Evade in such ways. Eventually they'll get sick of you.