In Oz in the old days (DCA etc) engine restarts in singles was part of the syllabus.
Two types were required - a normal shut down & start using the check lists - with some no engine handling & trimming for the glide.
Then you had to do a 'dive' restart. They were a lot of fun, and were always done over a good field, just in case.
I must have done hundreds of them with no hassells.
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'of the varieties of the real & unreal, there are many!'