Not in the dice rolling mood. Can’t find anything about using one with two HF radios and one antenna.
I know using a switch and two CB radios has been done. That's why I posted a coax switch. Although, I do not use the set up. I feel safer swapping coax from back of radio. You may consider setting up a 11m antenna in another location far away from your big boy radio.
I once keyed up running power and blew my friends radio due to close proximity.
Another aspect I have been looking into, unfortunately time is sparse, is setting up an old bearcat scanner to listen in for transmissions.
Then swapping to that frequency.