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I'm thinking about making the outer sleeve. Do you think there is any kind of market for them?



I agree.
72 and earlier rotors are around 100 bucks each.
The 73 is only 30 bucks each.
70 dollar price per side difference.
If your kit can come in at anywhere in that range and let people save say half that I think you would sell quite a few.
If you can sell them for say 40 bucks for both sides, I think you would have quite the little market for people with 69-72 cbodies tired of spending that kind of money replacing rotors, not just people converting from the 65-68 drums to disc.