I suppose most 4 pots can be made to fit. Directly, by 'massaging' either the caliper or fork mounting points. Or by shimming in or out. If the caliper(s) you've found need mounting brackets to fix to the forks, tape a length of welding wire to the outer circumference of the disc, to give caliper clearance. Position caliper in preferred position, against wire. A big help here is adapting a banjo bolt to take an airline fitting. Apply air, and caliper will remain in place while you make your cardboard template. It goes without saying, you need to make sure the wheel doesn't turn whilst you're doing this!
Edit: You could also rig up and use the bikes hydraulics as opposed to air. Just sayin'!