By putting Heff in the way of enemy ships, you'll possibly get to trigger his ability. However with so many of the juicy aces having abilities allowing them to re-position it is a hard sell. If you're stressed, Chopper will allow to perform an action still.
The problem being though, with only two actions available and no EPT, Heff doesn't do anything amazing.
BoShek could be used here to create a zone where ships will want to go nowhere near the U-Wing but it will also paint a massive target onto it.