Hi Kahuna! Welcome to The Reef Tank! Everything that you have outlined sounds good. I have a BakPak, and I would imagine that you could just run a tube of some sort from the pump to the skimmer. I use a
ball valve on nearly every one of the pipes on my tank (and there are quite a few of them) and although not as precise as a gate valve, they get the job done. Regarding HOB overflows, I know Wrasse Man has one, and at a WRS meeting some people commented on how nice it was, maybe he can give you the name

Tell us more about your tank, and welcome!
Drew