Different DNS settings or VPN between bands in rt-ac68u

[ejh]

Hi I've decided to get the Asus RT-AC68U.

Is it possible to have different DNS or VPN settings between the 2.4 and 5 GHz bands?
Basically I want to have 2 networks - one for "home" devices and one for "work" devices.
I want different DNS settings between networks, so I thought getting this to work using the bands.
Is there a better or easier way to do this?

Thanks!