Sounds like Calton customizes the interior to fit but they only make one shell at this point.

If you missed the following thread about Goran's quest for a lightweight carbon fiber case the link is below. He ended up getting a truly custom case from Accord which he is really happy with. Apparently neither Calton or Hoffee currently offer a case that will fit long-scale Alembics, Calton has been promising a new design for a while but so far, as you found out, nothing. Good luck with the search!

http://club.alembicguitars.net/index.php?topic=24051.0

They told me next year they hope to have a long scale case.

Hey Stephen, I just got my Balance K 5 string, that will go into another Accord case.
Just to add, I can fit cable, DS-5, tuner, strap inside small box so it won't damage the bass, I still love that case!

Hi Goran, I would love to have an Accord case for my Balance K five-string. I can barely pick up and move the bass when stored in it's flight case. Is your new five-string long scale?

Yes it is.
Here they are