I was talking one time to a Ngakpa friend of mine and we were discussing his foray into Hindu Tantra, mainly studies of the cult of Kali, the discussion then got around to various teachers here in Greece that were attempting to meld Buddhism with other Eurpean mystical religions: ancient Greek cults, freemasonry, etc... My view is that the Buddhism we are practicing here in Greece should be kept as close as possible to the traditions brought here by various lineages. Now my friend accused me of orthodoxy, and I seem to fit into the brittle taxidermists/dry intellectual morticians that you are describing, but my logic is this: The stage of development that Buddhism finds itself in right now (here in Greece) is way too immature for us to be trying to "spice it up" or to make it "evolve". It would be like trying to prune a seedling, more likely than not it will lead to its premature death. Unfortunately we still need to (at this point of historical development) be orthodox in our practice, language and philosophy.
I believe that Buddhism in the West will "evolve", but you can't make it evolve, it will evolve through our continued practice. When we reach a certain level of attainment in our practice then we will also have the wisdom to add and subtract from Buddhism. It's no use doing it prematurely though.
When Ju Mipham was visiting Dhagpo Kündröl Ling in France he "discovered" a number of protectors living in the mountains surrounding the monastery and these protectors were added into the main protector practice. This is how Dharma evolves. Realised beings adding to range of practice and pracitioners following these practices.
Then, of course, there are Western tulkus, if they take up their education and practice, the Dharma will start to evolve through their enlightened action. Unfortunately not many of the western tulku are taking up the path. The founder of Dhagpo Kündröl Ling, Gendeun Rinpoche, has incarnated as a westerner but the parents (being westerners) are not keen on cooping up the child in a Tibetan monastery. But at this stage that is what is required. Western tulku may start to alter the face of Buddhism but that's a long way off still. And it seems that western tertons are a longer way off in the future.
So grin and bear it , put down virtuous roots and who knows, next time around you may be studying under a western rinpoche with a fresh (but valid) approach to Buddhism.