Pup has been eating fine, and continues to eat fine, including relatively hard stuff (no bones or bully sticks but softer dental chews). He does have an accumulation of plaque on said tooth which indicates he favors the other side, and despite the hard pitch, I doubt the vet is lying about a fracture.
The literature online is very equivocal about whether tooth removal is needed and says some fractured teeth are fine and don't cause pain.
Any advice / information sources you trust on how to triage this situation?
You need to balance the quality of life of your dog, the cost, the change of death or other complications, along with alternative options (such as switching food when it gets worse).
And the risks may be acceptable, especially if it comes down to "dog continues to live with ever increasing pain" vs "99% chance of pain free vs 1% chance of peacefully passes away on the operating table".
That doesn't help much I know, just make sure you get advice from people you trust have a care about dog's quality of life.