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New AD affecting Trig transponders, e.g. Avidyne AXP340 and Bendix KIng KT74. See attachedAD 2019-13-03.pdf

My M20C just entered the avionics shop to get a major panel update. I am then planning on using this plane for all my instrument training and hopefully well beyond for real world instrument flying. My center stack will include new PMA audio panel, GTN650, KT74 transponder, and a serviceable SL40 com2. About the only decent existing piece of avionics that I have is the KN53 Nav2 radio, and I'm too much of a CB to throw it out in favor of a new low profile Nav/com. However, all this may not quite fit into the diminutive center stack of the M20C. If not, which item should I move to the right? I'm thinking the Nav2, but my avionics installer, who is an IR pilot, suggested the transponder. My specific question is: how much do the instrument rated folks on here with modern panels use their Nav2 in the real world? I know dual navs are traditionally used for fixes and they are even required for some VOR approaches. But it seems these days that GPS substitutes well for just about any use of a second Nav? If I keep it in the center stack, the transponder will have to move to the right. This would be fine if I got the Garmin transponder, which can be controlled by the GTN650 interface, but I'm too much of a CB for that either, since the KT74 is 1 amu cheaper for hardware and also swaps out directly into my existing KT76a tray.