*shrugs* You clearly have a significantly different interpretation of Rovagug to me.
If you actually read his entry in Inner Sea Gods or any other literature you'll find he's never mentioned to be 'stealthy' or 'tricksy' in any way at all. He is the metaphorical definition of wanton destruction and annihilation. Very now, very short term - very little long play there.
But I'm not calling badwrongfun here - just that you're running a different Rovagug than others would.
There's many subtle ways that Norgober could be used to subtly influence proceedings - but again you're defining him as above fault - so... guess no room for interpretation there.
As a non-god specific suggestion, have them discover that they're being used mid-venture - then it's on them as to how they subvert that for their own purposes.