Encrypted CD/DVDs via gbde or otherwise

[R. W.]

I have some data in an encrypted gbde partition. I'd like to be able to 
move some of it out to CD-R or DVD in an encrypted, mountable form (as 
opposed to simply encrypting a tar file and burning that).

Most other encryption schemes support this through container files. You 
create a 650MB container, mount/attach it, copy the data, 
unmount/detach the container, and burn it to CD as a single file on a 
data disk.

AFAIK gbde doesn't support container files. Is it on the roadmap? Or is 
there any alternative.