Why not just have the long ferrule welded in the
Anyways, that is what I just ordered to install my elements in BK and HLT. Your way just seems like a lot of extra work unless you are trying to save on the cost of the NPS element adapter. The benefit with that adapter is the threads will be correct for any element you use (NPS vs NPT).
Yea Ive seen that a couple times, it seems a bit pricy, and I saw one thread that questioned its ability to keep water out.
This seems like it may be a decent way to go also
http://www.stilldragon.com/element-guard-kit.html