The problem with current techniques is that nothing works reliably. If you can go so high as to have a document that works to deconvert 10% of educated theists, then you can start examining for regularities in what worked and didn't work. The trouble is reaching that high initial bar.
It seems to me that Derren Brown once did some sort of demonstration in which he mass-converted some atheists to theists, and/or vice versa. Perhaps we should investigate what he did. ;-)
(Updated following Vladimir_Nesov's comment - thanks!)
I've often had half-finished LW post ideas and crossed them off for a number of reasons, mostly they were too rough or undeveloped and I didn't feel expert enough. Other people might worry their post would be judged harshly, or feel overwhelmed, or worried about topicality, or they just want some community input before adding it.
So: this is a special sort of open thread. Please post your unfinished ideas and sketches for LW posts here as comments, if you would like constructive critique, assistance and checking from people with more expertise, etc. Just pile them in without worrying too much. Ideas can be as short as a single sentence or as long as a finished post. Both subject and presentation are on topic in replies. Bad ideas should be mined for whatever good can be found in them. Good ideas should be poked with challenges to make them stronger. No being nasty!