I set up the following experiment.
Pan A (top) connected to RX1 and TX1 antenna port
Pan B (bottom) connected to RX2 and TX2 antenna port
port 1 connected to 1/2 wave end fed 40M vertical over 4kft of wire
port 2 connected to W5GI variant of G5RV at 50ft
Antennas separated by about 175ft
I used DDUTIL to readout S-Meter data on pan A & B, as well as transmitter power from my LP-100A watt meter
Here is a video demonstrating my results. The conclusion is my radio with this setup is 100% safe. When in half duplex mode the ADC is isolated from the RX antenna, and in full duplex mode I was able to measure the signal on my ADC and it was well below any danger from my transmitter.
Also it's great to have a radio from which I can get accurate data and determine precisely if there is any danger without just guessing.