If you want to put
more doubt on him doing that you could also say:
(This is present/future, not past.)
In my opinion, should he do that kind of thing, he will meet so and so consequences.
which could considered in BrE to be coloured-future (i.e. something colored by your emotions/opinions, see:
SHALL AND WILL
Rule 2. The Coloured-Future System
http://www.bartleby.com/116/213.html#2
This part in Fowler is the absolute authority on traditional/prescriptive
should
in BrE usage, as I understand, but it's not easy to read,
but I've found it of great help when reading classical English
novels.
BTW, as you see, there's no if in this version, thus should can be used in that clause in standard speech, with the inversion causing the conditional meaning.
This version may be more BrE than AmE.