I am running a Honeycomb Alpha, Honeycomb Bravo, 2 Logitech FIPs, a Logitech radio panel, Thrustmaster TPR pedals, and a RealSimGear GNS530 along with Spad.next and I have never had a problem with any of it. My controller profiles in MSFS are basically empty with the exception of the primary flight controls. I do it all through Spad.next. (I don’t even use the RSG interface application; I control the GNS530 through Spad.next as well.)
I am obviously not running 6 Logitech FIPs, so I can’t speak to how that would work, but it works great with the hardware that I do have.