Man, tough situation. Do you have other farrier options? That's really your answer. Otherwise, if he's an amenable sort, do you think he might go for the "humor me" line? If you don't have another farrier option, and he won't go for that, sounds like it's time for you to go to remedial farrier school
Interesting about the plastic track (what is the material, recycled something?) and those fractures. Yikes!