Entering compass calibration on dx6i

Hi all
I have built my f450, set up assistant and assigned flap switch for home lock on and off and a mix on gear and throttle hold to give me gps, attitude and manual mode.
problem is to get into the compass calibration setting (solid yellow light) you have to toggle the two said switch alternately which I find a bit of a pain and today have spent ages trying to master it!
has anyone set up a way of doing it on one two position switch or is that not possible? I am not sure if you have to toggle across all 3 flight modes or just two?
any help apprciated
 


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