Build a ground of Trust for the Subject Matter Experts

Establish an invisible thread of trust between all the parties, always emphasize to the SME that:

1. The writers who are interviewing them are there to help them convey what they want to say in plain English
2. They have the authority on how the interview will be conducted (as long as they are comfortable with everything)
3. They have the last say on everything, so you as the SEO need to be assertive that whatever goes out there in the public was reviewed and approved.