Unfortunately the Texture Coordinate node only gives us the active UV map (as indicated by the highlighted camera icon) and gives us no way of choosing which UV map we want.
Luckily we have the Attribute node. Simply enter the name of the UV map you want and connect the Vector output to anything you like to use those coordinates.
That’s it. Yeah a short and quick CIF this weekend, I’ve got a tight deadline and am fighting bugs… more on that later.