You might get the best results if you ask for Dominic at mygoflight. If you still hit a dead end, please feel free to call me as I've been tinkering around with all kinds of different combinations for several years now. 360-658-8866 (pacific time)
On a related note the smaller Garmin Aera 660's can be a terrific option and can supplement the use of ipad's - plus they can cut down the amount for heads down time swiping at an ipad. Also, the 660's have superior screen visibility in bright sunlight, don't suffer from heat problems and can minimize ipad swipes - especially for those of us who do not have the SV feature on our G1000 PFD. These units (ipad with a 660) used together is an awesome combination (IMHO).
Finally, for ipad cooling (to avoid untimely ipad shutdowns in our greenhouse airplanes), check out:
https://x-naut.com/
Mygoflight has a slick adapter for these as well.
Hope this helps.