I know you don’t want to do custom profiles. But since your profiling straight barrels, here is a thought. I think there would be a market for profiling someone’s existing straight barrel to one of your existing profiles. Much like if a customer wants to use their own wood and you put their blank through your CNC process.
Several of us might have a few 1”, 15/16” or 7/8” straight barrels collecting dust that could be candidates for a slim swamping. If you had some gradual profiles that would fit these measurements, (below a certain caliber of course), I think there would be a market for profiling them and bringing some surplus straights out of the shop rafters and back into service. Maybe one choice for each diameter in 42” or 38”. If longer, it would be cut to one of those lengths. Perhaps skip the precut lugs, if not enough meat available. I would be a customer if so. These might not fit any of your existing kits, but it would be a service for reclaiming NOS barrels.