I'm sensing the OP is venting and perhaps looking for another qualified farrier/trimmer.
Shoot, I am surrounded by farriers and so-called barefoot trimmers --- most of them aren't worth a Pinch of Salt and about half of those show up when they're supposed to
200 miles is a long-butt haul, no matter how many horses are involved; I'm sure whomever was/is doing your hoof work grows weary of that, especially in your Ontario winters
Is there anyway possible someone in your group would be willing and able to learn trimming? Seems to me that would be the Lesser of the Evils in your situation
The horses that need corrective shoes - is that because they are ridden all the time and need shoes to prevent something from happening during all that hard riding? If not, I'm sticking my neck and saying they don't need shoes - they just need a trimmer that is very well versed on problem-solving the correct way
The shod horse(s) would benefit greatly from being trimmed every four weeks (therefore could probably stay barefoot) but, from the sounds of things that is an impossible feat
Again, going back to the question - is there anyone in your group, with common sense and logic, that would be willing to learn the trade?