TX inhibit by RCA TX Req

I want to implement a TX Inhibit function on my 6600 to prevent equipment damage in case my Steppir antenna start tuning while radio is transmitting at high power.

I have Tuning relay in SDA100, which is configured to switch to GND when antenna is tuning.
There are RCA and ACC TX Request inputs, active Low, which inhibit TX ONLY BEFORE TX start.
If 6600 is already transmitting then grounding RCA TX Req pin doesn't inhibit TX.
This is a BIG problem, because it will burn sliding contacts in EHU and it will cost a lot of money.

I built two simple boxes with a relay and a 100W dummy load inside for my SO2R setup to avoid this problem, but I think it will be much more simple and better if Flex team change the way of operation of TX Req pin.

I red somewhere about logic for such behavior. The operator will be able to finish the QSO and not to be interrupted by other operator.
My logic is different - I would prefer to have 100 NIL QSOs in a contest instead of burnt EHU


73! Boyan LZ2BE