In reply to Amroly-Poly:
I am not a medic but a biologists working in a stem cell intistute. From my POV I would forget stem cell treatments. With very few notable exceptions (hematopoietic system / bone marrow transplants and bone reconstruction for gaps in long bones or worn out hip prostheses) they are still highly experimental. This is also true for using stem cells as anti-inflammation reagents, e.g. when co-infusing mesenchymal stem cells for suppression of acute graft versus host disease. Anything on offer for fixing a torn tendon is a criminal rip off at best.
Let the toe heal as good as it goes, and rather spend money on custom made shoes or insoles that help spread the load. As others have said, many climbers have continues after toe amputations.
CB