How to protect SteppIR antenna when using Power Genius XL?

I haven't received my Power Genius XL yet but while reading about the amp I developed this question/concern. Since SteppIR antennas can take a considerable amount of time to tune between significantly different bands the SteppIR controller can be configured to include a lockout relay that prevents an amp from keying while the antenna is tuning. SteppIR says DON'T transmit with an amp while the antenna is tuning. However, I understand the PGXL integrates to the 6000 series radios with only the Ethernet connection, and I don't see any sort of TX prevention input on the amp to interface with. Has anybody thought this out or found a solution already? I intend to position my 6400M and PGXL remotely at a mountain cabin so I won't be local to monitor the SteppIR tuning process. I'd like to protect myself from the occasional mental glitches that can happen. I imagine I could interface the SteppIR TX protection to the "TX Request Input" on the radio to inhibit all TX while tuning, but I'm unsure. I thought I'd ask the community in case others have already found a different and possibly better solution. Thanks in advance...