The issue which having someone else do this for you is that to do alternative process well requires exposure curves being applied to the negative. Otherwise getting an even exposure where the highlights clear and the shadows are nice and deep will be difficult, if not impossible. And the curves will be different for each process. Furthermore, the paper you print on, the type of UV light, your coating method, and the mixture of chemicals you use will all effect the curve that needs to be applied. So this really is the type of thing best done on your own. Now, you can find a company to scan your negatives, take the scans and apply your own curves, and then have someone else print them out for you. But before doing all of that, you’ll probably want to make some step wedges to test your system first, and measure the results to establish your curves.