Bob has great information here I'll try to fill in some other bits. I did find your email in the spam section of the support@ account. The email headers looked clean with a neutral spf so not sure why it was rejected.
The EMS can be moved to the other screen. This is done in house as the unit needs to be calibrated once its moved. If you plan to upgrade to AF-5000 series I would highly recommend considering switching to the SV-EMS-220. The best part of the Dynon external modules is that you don't have to send in the whole screen in for repair. Horsham Aviation in Victoria, AU should have modules in stock to minimize AoG.
The only ones we currently recommend switching is the VDO Oil and Fuel pressure sensors. We have fully moved to the Kavlico's 3 wire sensors. They seem to have more long term stability and are less error prone.
Does your Trutrak fly with the EFIS already? If so no reason not to use it. If you are thinking of upgrading the Trutrak head then it might be worth the cost compare between two new Dynon servos.
Garmin has not released their ADS-B In protocol used for the new line of transponders. We can still provide altitude to the Garmin transponder. For ADS-B in we have the SV-ADSB-472.
Pitot and static will need to be routed to the old magnetometer install location and will be replaced with the new SV-ADAHRS-200.
25% off a new EFIS with EFIS trade-in, and 25% off new AHRS with AHRS trade-in.