I wouldn't expect an existing publisher to be interested in your contributions. Print publishing is such a low reward business these days, existing publishers want you to buy the editions they have invested in creating, not start new ones. The last paper score shop in NYC closed last spring, it was covered in PBS.
OTOH, paper editions do have a small niche market made slightly rewarding due to the free publicity of the internet. There is a print shop in Lexington KY making hand printed books, with some success.
So, you need to create original scores in photo or print form, that some such business with presses would reproduce for you. Then the act of selling them could be at your own risk.
The differentiation would be, for example, the use of archival quality paper, instead of the stuff that runs through copy machines. I've had photocopies yellow and get brittle in only ten years. And I was appalled at the paper quality of a famous source of the works of Debussy, for example. 9"x12" scores, plus, original Debussey checked editing, plus, turned brown between the time I bought it and the time I have to practice it, minus, rips up when I turn the page, BIIIG minus.
There is a reproductions house in Indianapolis that produces paper copies of things available in IMSLP. Not having to go to the library and wrestle with their practicies and printers, big plus. Paper quality, minus, 8 1/2 x 11 format, minus. I don't know if this will yellow or get brittle in 20 years, but we'll see.
There are a lot of words in the paper business that are just adjectives, that don't mean very much. Acid free, archival quality, hand laid, blah blah. What I want to know is will it turn yellow before I die, will the pages rip, will they stand up on the music rack without the corners turning down? Will the binding fall apart? Peters & Dover have **** for editors, but their editions I bought in the early 80's are holding up okay. Can you break into the paper part of the print business enough to print good editions, useful for keyboard players that don't want to buy a new wonder display every five years from the wizards that brought you sand islands in the S China Sea? Can you apply all the free scholarship on scores that resides in all the forgotten theses in libraries around the world, without violating copyright? Can you do that and stand up on the music rack, too, for more than the six years that copy machine paper will stand up.
So the world is looking for someone to make a few really good copies of famous scores. A brand name could be built up with a reputation for quality and scholarship. It could be you. It may not be remunerative. At least you don't have to worry in that business about the format going obsolete, the way computer games lose their target platform. People are still learning piano, thousands in the far East alone.
Best of luck in your trial.