I had custom jerseys (2) done for this last century I did, by my local silkscreening/embroidery place.
Often they have a minimum, but if you explain what you are doing, they might be more willing to let you do one or two.
Especially if you offer to give them more business (for us, we told them we would give them our business for any future jerseys, t-shirts, hats, stuff like that.)