I've used Bruce Gordon's low rider racks, on multiple tours.
I got a front rack fabricated .. it's fitted on canti-brake studs and the fork crown ..
It was narrow , and so, later, I added a piece of 1/4" plywood so things stay on better.. quasi Porteur..
Took a lot of pictures with my photo-gear bag on the ground near the bike , before adding a platform .
since unstrapping it = having the bag fall off , so I set it down .
Thus, you might consider a front rack with more width than the nitto-Riv thing.
they are only thinking of handlebar bag supports with those.