If you look around you can get 7 & 8 speed rapid fire shifters in both black and silver both with or with out the brake levers, I seem to find/have mismatched pairs of both in my bins. Black is just the more common color but silver is made. I think you would have no problems with the plain shifters without the windows & w/out the levers working on a set of north road style bars but as someone else stated there is a difference in pull between MTB FD's & road FD's so you would have to match them up with the shifters you choose.
As much as I don't like the looks of grip shifters there are some good ones out there that work really good and is what is used on bikes that run a North Road style bar nowadays.