I've a feeling that most of the weight of a recumbent is on the rear wheel, so you might experience traction issues on steeper gradients. I had similar issues on an upwrong with Dutch style bars.
You might be better off posting your question on pedelecs.co.uk/forum to get more experienced eyes to give you answers.
FWIW, I've had front-, rear- and mid-drive set ups. FWD was the least satisfactory of all three in terms of both performance and looks. The wiring can't be avoided, but is much harder to disguise on a FWD set up.