I have found the df13 to be the only source of all my delays with the apm, which cost me maybe 20  times the cost of the apm and months of trials and failures.

Is there anywhere anyone to sell an apm with plugs like servo plugs ?

It would take to also change the GPS , telemetry, power and compass plugs, but those changes would be so worth it I would happily consider payng 50% extra for those modifications as I intend to sell a plane dedicated to photogrammetry and cannot seriously sell anything with those df13.