Sando, I find your thinking clear.
ONJ is least common with Evenity. And most common with injected bisphosphonates. And most common when these medications are given for cancer metastasis to the bone. At 64 days you are losing or have lost the effect of Evenity. It doesn't clad to bone the way bisphosphonates do.
You probably have all this figured because you've come to the perfect conclusion--on your own. But:
Bisphosponates lower new bone growth and preserves old bone. The blood supply isn't maintained in bone that isn't growing. That in turn affects the vascularity of the epithelial surfaces of the mouth. So oral wounds don't have the blood supply to repair themselves. And of course the bone itself can't repair itself. ONJ is difficult to treat. Forteo is often used propholactically with dental work. And is the standard treatment for ONJ and ATF (atypical femur fractures) Even though it hasn't been used following Reclast, three months of Forteo, in my calculation, would be a great advantage to your bones as it initially greatly increases osteoblasts while the withdrawal of Evenity increases the osteoclasts.
The onset of ONJ with Evenity is usually within 30 to 40 days.
In your position I would get bone markers, start Forteo, finish dental work and wait 2 months after dental completion. If you can get bone markers, I'd get them at one month of Forteo to be certain that there was no general bone loss and at two month to see if my bones would be better off with Forteo than Reclast.
I think you are pretty safe, anyway. And I don' t know anything.