The GTN 750 in this a/c is truly awesome, and I would love to have the GTN 650 companion, instead of the NAV2/COM2 handled by the GNS 430. According to the panel guru, Bert, over at simforums.com there is no way for this to be implemented by anyone other than Alabeo. I haven't heard anything from Alabeo about plans for the full 750/650 implementation, but maybe somebody else knows something I don't?