single point focus assign button ?

hi i currently have back button focus and use it all the time as i only shoot birds and other wildlife using 9-15 point focus points , but at times wish i could use a function button to get a single point focus like on the d500 is there a way on the d7200.

You can most likely do this by using the u1 and u2 function on the d7200.

The U's give you 'everything' so that might present new issues when trying to quickly switch to U1/U2. Other U settings might not be exactly what you want. The closest I can get to solving this is menu f6, 'release button to use dial'. This makes it a one hand operation when I have my big lens on and need to always support it with my left hand. So with f6 turned ON, I can tap the focus mode button, then move on to the wheel. With a little practice remembering which direction to go, I can do this pretty quickly and switch between area modes. This also works to make the other back buttons like iso a one-handed operation.
In say d9, 21, etc, the point chosen is the starting point. For a bird on the water, I can get away with leaving it in a dynamic mode. However, a bird in the tree confuses focus with my Sigma 150-600 and I must switch to single point. A button would be nice. I have one of my front buttons programmed for spot metering. It would be nice to have the other button jump to single point focus.