An H90 into a Sansamp is basically everything you could need.
In fact I used that exact set up 2 weeks ago in Ashville NC at a gig for an acoustic. However -I dont have the Acoustice fly rig with a built in compressor -so I had to burn an H90 channel for compressor (my fly rig is the regular one) -ideally Id use the acoustice sansamp flyrig version in the future to preserve both channels in H90
I have to say that the Acoustic Fly Rig is a great pedal, and I can imagine that into an H90 would be a great portable rig.