I don't disagree with anything you said Dave. If there were Branson dealers in every town this wouldn't be a problem. My situation isn't that unusual that the nearest dealer is nearly 100 miles away in a direction I don't usually go. So it is much more than just a $5 or $10 inconvenience to follow Branson's filter recommendations.
I own 9 vehicles that use oil filters. Branson is the only one where using a commonly available filter is stated as a problem. I use aftermarket filters in all except Branson, not so much to save money, but because they are readily available.
NAPA, Wix, Fram, etc don't even list the new Branson's as a filter option. It is such a small, insignificant market that they aren't likely to do the reverse engineering that you mention. That would be a task much more suited to Branson as they are the ones who have made a tractor with the non-standard filter requirements.
I certainly have no desire to become a filter engineer. It does bother me that Branson puts their customers through this inconvenience and uncertainty with out so much as a reasonable explanation. Agreed this is not an overly big deal and doesn't really detract that much from Branson's overall standing as a good reliable tractor, but it is still frustrating.