I don't know what anyone could use it for but it's all yours. It's currently hosted on my Google Drive but feel free to let me know if there's a better place to host it or if the account's bandwidth is used up.
Things I imagine it being useful for things such as trying to port Republic Wireless to Sprint or other Moto G's, figuring out how Republic Wireless sets up the whole system, a fresh start for users who killed their phones, etc.
Of course, it might not even be able to be manually installed, though I'd think using the stock bootloader would be the best bet.
It might just be good etiquette, but I'd also appreciate you referring to this thread if/when you share the .zip with someone or work with it, as it seems like I'm the only one who's done this and I'd appreciate just a smudge of recognition if it leads to anything important.
Edit: Also, if someone happens to have a Sprint Moto G lying around and doesn't care what happens to it, I think it would be in a lot of people's interests for you to try and flash the update, and then report back on it.