Here's some market research for you:
If it isn't the same size and shape as a 1911, it won't be a 1911 -- no matter what you choose to call it. Take Sig Arms as an example. When Sig started making 1911s, they changed the exterior style of the slide -- and they didn't sell well at all. Sig finally added some models with "classic" 1911 slides to their line, and they now sell both. The only place I have ever seen any of the Sig 1911s with their proprietary slide design is at the Sig Academy in New Hampshire.
Few 1911 aficionados consider the Coonan to be a 1911. We recognize the similarities, but we know that it's not a 1911.
If this market that you know exists doesn't care about 1911-ness in your new pistol, that's fine. But you opened this discussion by stating that you wanted to develop a new cartridge for the 1911. Now it turns out that you want to develop a new cartridge for a new pistol. That's a significant undertaking, and I really don't see any market for it.