Never tried this before... but could be cool i think.
The problem is that Fevered Dreams aswell as Fragility only trigger on new conditions... reapplying doesnt.
Could be nice tho if combined with "Crystal Wave" (removing conditions from foe).
in case I'll be online next days ill try to set up a build and try it...
skills that might go nice with those:
Crystal Wave (remove all Cond. from foe)
Shockwave (Add 3 Cond.)
Virulence (Elite) - (Add 3 Cond.)
Foul Feast
Plague Sending
Hypochondria
Signet of Deadly Corruption (Assassin)
Waiting for more input
Cheers