I'd say be save and just use a group of 3 assasins and a scout. 3x assassinate then take it with the scout and keep moving
Having said that I think it'll be slower than regular expansion since it takes more turns. Also loosing an assasin can be more expensive than just loosing 1-2 troops each province.
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Want a blend of
fantasy and
sci-fi? Try the total conversion
Dominions 3000 mod with a new and fully modded solar system map.
Dragons wanted? Try the
Dragons, Magic Incarnate nation.
New and different undead nation? Try
Souls of Shiar. Including new powerfull holy magic.
In for a whole new sort of game? Then try my scenario map
Gang Wars.