I think the reference to Promitheus was for the Apollo preamp, but that uses the TVC with a gain stage (6 or 12db) which is not what you are looking for. I'm sure Nicholas could custom build what you wanted but that might be a bit risky.
It's possible that Jeffrey Jackson at Experience Music could help you. He has a lot of experience with the Intact Audio autoformers and incorporates them into his active preamp designs. Jeff is a big fan of passive linestages and if I were to have something along the lines of what you're looking for custom built for me he'd be near the top of my list.