That should work!
I added 5.5 (someone got excited and drank half) - 65 IBU beers and it did a nice job of balancing out the sweetness. The final result was much more drinkable.
The only problem was that I couldn't really shake the keg so we had to rely on natural diffusion to move the hops around and so the first few beers bottled were still sort of sweet. Funny thing, when we did a taste test, some folks liked the sweet ones and some liked the more balanced ones. Those that liked the sweet ones were wrong.