For various reasons, I've had reason to think about Druidry and its potential revival as an option to help handle a religious crisis, as well as potentially being beneficial to many Western cultures.
Much of what was known is said to have been lost to time due to a combination of oral tradition and a doctrine of secrecy within Druidry. Although Druids are frequently depicted primarily by their closeness to nature, it is said that Druids actually formed a priestly, judicial and professional class in Celtic cultures, contrasting with the contemporary world's professional specializations. Druids also believed in immortal human souls with re-incarnation.
The idea of a Druidic revival sounds interesting, but the oral restriction of past Druidry means that any attempt at a revival is inherently limited, constraining new Druidic traditions so that they must start effectively disconnected from the original Druids. The issue is compounded by the contemporary tendency towards a merely aesthetic Druidry. However, I do not think either issue is entirely fatal. If going this route, or going a similar route with another system, it may be worthwhile to take advantage of contemporary factors rather than shun them.
In particular, I would suggest that a Druid should be familiar with technology and the philosophical work that went into its development. This does not contradict any concept of being close to Nature: technology is fundamentally the application of Natural laws, and it strikes me as an unusual concept that the use or sophistication of these techniques is the issue rather than the correct or incorrect nature of their application.
The practice of computing in particular is closest to mathematics and logic studied properly. It is my opinion that despite how it may seem there are sacred things in computing. When the ugliness is stripped away and a beautiful core kept then computational truth reveals itself over and over. The practice of programming challenges the mind with a demand for precision, and the same technology and practice graduates naturally into techniques such as theorem proving, which allow for obtaining and verifying truth directly.