CCL is definitely the right solution for replacing NCP, but BSC support is going to be hard. There are BSC to SDLC converters, but they're expensive and hard to find, and there aren't too many people left alive that know how to configure one. It may be time to bite the bullet and replace the BSC devices -- it has been 20+ years now since BSC was deprecated in favor of SDLC. 8-)
If there absolutely isn't any way to replace the BSC devices, the small 3745 is one easy solution, or find a BSC to SDLC converter, and then use a small Cisco router to convert the SDLC to DLSw and then to CCL. You might see if one of the remote models of 3745 are available -- some of those could be attached to a router via token-ring or Ethernet, and I think at least one model provided BSC connectivity (can't check because all that old stuff is no longer in the online version of the IBM sales manual....grrr...). You might also ask Fundamental Software whether a Flex CUB could be converted/adapted to support BSC NCP or EP function. I don't think it currently can do it, but it has most of the right pieces to do that, and BSC adapters do still exist for PC hardware. Might be expensive, but if the BSC-only hardware is equally expensive, it might pay off in the end.
