These sites puts translations/hacks into an NES cartridge they are...
Nes Productions and
Game Productions. The prices are pretty affordable too, I'd love to see one of my hacks on a cart.
Oh shyeah, The Nemo hack I made back in 2004 was called Pimpin Extasy. It's more like a New York street story with a touch of ghetto in the mix. There was an e-mail I got last summer from someone that requested it, since they couldn't find it on my old Geo Cities site. You can find my Nemo hack on my site.
I'm pretty confident you'll like the Nemo hack.
One thing for sure, you hack games that aren't touched at all, I can only imagine of you woulda hacked SMB3.