No genius here; just proof that if you stare at a problem long enough a solution drops into your lap. Note the abundance of 'speed holes' as I worked out the solution...

Used 16mm M10 bolts, nuts & washers to attach the OEM top mounts to the radiator support braces; a touch of adjustment with a BFG corrected the angle and voilà; radiator mounts to attach with the rivnuts to the crash box.