"He who marches out of step hears another drum." ~ Ken Kesey
Sorry, White shirt so no underbase needed.
I think that's doable in 4 colors sim so long as they are ok with the blends being a little off from the original art.
Dye sublimation would solve all your worries.
I would do 4 color SIM PROCESS..... you can use the deeper blue color to shade under that orange to create that deeper orange colorif you need seps we can help with that if dan and the others are too busyGreenBlueOrangeYellowdepending on how the seps are done you might need a flash or two