Install a garmin GDL-88, that has its own internal GPS source and ADS-B out. Then, you get poor mans TCAS into the bargin, because the 88 can receive ADS-B directly from other aircraft in range, and will display it on the G1000. It's about $4-$5k just for the unit, and has a very comprehensive STC AML list, so no EO, just need to get it installed.