Outsource the work.
“Outsource the work.”
If it came down to it, what would - as you suggest - prevent the Christian artists from simply bringing the offending order to an accommodating shop down the street? In a rational world, nothing that I can see.
While reasonable, I suspect that if the Judge got wind of this, the Christians would be held in contempt. The Christians MUST be made to submit.
(”Submit”? Hmmm...isn’t that what the word “Islam” translates to? )