The lifeguard stuff is really designed to fit together rather than be added to a system piecemeal. I agree that a closed loop running off the sump would be the easiest way to do it. You could run the loop out of the display I suppose but then you'll have to consider how to do a decent siphon, in the sump you could just have the pump in the tank.
Having it working a second return from the sump would have it's advantages, it might save you if your primary pump fails. This isn't going to be much fun to plumb, it would be easier if you can lift the unit to a level just above the top of the sump than you can go out, in to the UV then up to the tank. With the unit on the floor you're going out, down, elbow into UV, elbow out of UV and up 4', that's big head pressure. You could lessen it with sweeps and spaflex but I bet it would still be a b*tch.
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