Good account, and I too play guitar (no better than the next bloke, but I can defend my self fiercely with some 12 bar.), so I can appreciate your analogies.
Regarding tenon repair, while all situations differ, the only way I know to truly repair a shattered tenon is to remove it, and with a lathe, reconstruct one out of similiar materials, and counter sink it into the so-affected woodwind. It's a tedius, arduous process, requiring a steady hand, sound mind, and a lot of measuring, but a good repair is often stronger than the original.
While I understand, precisely, the dynamics involved, I am not yet ready to undertake such a repair, as I am not currently set up with the right work space or tools to affect such a repair. Tenon breaks are, as I have heard them referred, "profit killers", because they are so time consuming, and it's easy to go astray and further destroy the wood. These types of repair should be reserved for either truly rare woodwinds or ones where the sentimental value outweighs profit margin.