I could make that red dot sit lower with my milling machine, but if you have another gun that one fits, you might look at the Doctor or Burris Fast Fire III, both would sit lower with standard adapters. Probably a lot of cheaper copies available by now also.
Does Kraghaus sell a shorter mount? If Kraghaus is interested I could make drawings for the Doctor or Burris adapters that could be mounted directly on the barrel for a height that would match the iron sights. The Doctor and Burris sights are interchangeable I think except the Doctor uses metric and the Burris uses standard US unified screws. Locating pins on both are 3mm.