Artist IO - Audio Monitoring Editor and Client set of speakers ??

Hey,

What would be the most straight forward way to run 2x sets of stero monitoring out of an Artist IO ?

I want a stero output for Audio monitors on Edit desk (Left, Right & sub)

I also want another set of larger audio monitors a client review set (Left, Right & share the existing sub)

Is this easily doable ?

Would probably have this mixing board :

Mackie 1604VLZ4 16-Channel 4-Bus Compact Mixer

Would like to have just the one sub shared between both sets of audio monitors, and would like to be able to control output level to each set via the mixer, so only one set of speakers would be active at once.

Any advice greatly apreciated,

Thanks,

Dan