[Elecraft] K3 macro question

[Bill]

I currently use AN1; and AN2; to select between the two antenna inputs 
on the K3 - this requires two switches be assigned to toggle between 
antennas. Push button selection.

However, on the K3, only a single switch ANT on the rig to toggle 
between the antennas. Toggle selection.

Is there a macro or assignable command to toggle from a single key?

Thanks,

Bill W2BLC K-Line