There is a good chance that most of it will clean up but the shoulder area most likely will not. The Johnson has a short neck and sharp shoulder and the bee has a longer tapered shoulder. Not sure if an Improved Bee would clean up or not. A chamber cast or even better a pair, one of each, would give you the best idea. \
The barrel could be set back and if done right the holes for the scope mounts can be brought back up to top dead center, not a lot different than putting on an octagon barrel. 
Sam

The 30 carbine has a slightly larger base diameter and generally thicker brass than the 32-20/25-20. So it would run into trouble at both ends. Loose and well oversized neck.
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Probably easiest to form some cases from either a regular or Mashburn Bee die and fire form.

I think based on what you said about the scope holes, you would have to set the barrel back too far to clean up the neck.