Trump is actually a great candidate for the neoreactionaries: an apolitical strongman with barely veiled ambitions for unchallenged sovereignty. I'm surprised Mencius Moldbug isn't on the delegate slate as well.
FWIW, I've had some success persuading conventional Republicans to write in Hillary Clinton as a protest candidate in the upcoming California primary.
The underlying reason for which I think Thiel might support Trump is that Trump is ultimately a businessman, like Thiel, and one in the messy business of real estate development at that. (For a fun fairly anti-Trump piece that could also read as support: http://slatestarcodex.com/2016/03/19/book-review-the-art-of-...) A common NRx thread is that pretty much any chief executive (which includes military generals) would do a better job at being President (and even better King) than the more traditional list of possibilities like lawyers and professors.
Which is immediately disproven by the disastrous presidency of our first "MBA President" GWB. (See the fellating articles before people realized how awful he would be at managing the country[1])
[1] - http://www.americanthinker.com/articles/2004/08/the_first_mb...