You can probably find a consultant if you are willing to pay consultant rates because EMACS customization is probably going to consist of Lisp programming and t

You can probably find a consultant if you are willing to pay consultant rates because EMACS customization is probably going to consist of Lisp programming and that's the sort of thing consultants will do for consultant rates. IRC and Linkedin would be places to look. But a product has a couple of difficulties. One is that there are not robust mechanisms for obfuscating eLisp code. The other is that binary changes would be under GPL and the source would be available to users. And the ordinary problem that an Emacs product would be competing with free. There's not only good free tooling with almost fifty years of maturity, but also Emacs is about as deep into GPL culture as you can go.