If you don't succeed in Corozal, there is (or at least was) someone doing it in San Pedro and you can probably do the whole transaction with bank transfers and Tropic Air. There was an art gallery across from Fido's restaurant (not the one in Fido's, this was a cross the way). I don't remember the name but they had a parrot in there and it was tucked behind an outdoor coffee shop. They sold a lot of hammocks.
I had some photos transferred to canvas there. Maybe someone from SP can chime in on if or where that shop moved or who might now have the equipment.