The Adjustable EVO Holder might
work. Not positive though. You would still have a charging issue with that phone holder. Their support/sales staff is normally pretty quick about replying to emails. I would just ask them about Thunderbolt product plans.
I'm using a ProClip vehicle mount, but I am using another brand device holder. I am using a Bracketron Universal Holder. The sides adjust up and down, so I can still access the charging port and volume keys. The universal holders aren't the prettiest, but it gets the job done. If ProClip releases a holder that works with the TB with a case, I might consider it. It is nice having a holder that fits more than one phone/device though.
Here is a couple pictures of my setup. I just snapped the last two pictures. Didn't realize they were so blurry.