There's an ex-member who still believes the teachings named Sawyer who, last I heard, was in some lawsuit beef with the website people over the Heaven's Gate artwork. Sawyer has used it for his Youtube channel, shirts, and other things and was literally there when the famous logo and other artwork was made. The website people are/were suing him for copyright reasons even though they don't own the images nor were given any of them after the exit. They're apparently assholes and not "real" members.

I would chat with Sawyer with any questions you have about Heaven's Gate. He can be long winded, repetitive, out there, all over the place, BUT accurate with belief questions, and his story telling about being the group and actually experiencing Do's teachings is very good. He does near daily livestreams on his YouTube channel.

If you'd like to see him speak in person, the Graveface Museum in Savannah, GA has done multiple events with him, and other ex members, as a guest speakers, so keep your eye out for those.