You've got a tube bridge where on my Peugeot it only has a flat plate bridge. So there's no reason at all why you can't use a brake in that position. All you'll need is the usual saddle washers used to spread the forces into the tube without crushing it. This assumes that it's in the correct position to allow the pads to align with the rim of course. GIve it a whirl for a fit if you haven't done so already.