Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
If you are dead set on a QR, you might want to look at a cobra buckle. They can be plastic or metal and are much stronger than a standard QR. ScubaForce sells harnesses with cobra QRs (not sure they have the chest strap though), or you can just buy them else where. I've usually seen them at tactical oriented sites like MilspecMonkey. You'll want the 2" version with one side or the other being adjustable.-Chris
I'm using the UTD adjustable harness UTD Quick Adjust System · UTD Scuba Diving
Yes, it looks way to simple to work, but it does. No cutting of your webbing and I'm only using half (on the non-buckle side) I can go from a rashguard, to a 3 mm wetsuit, to a drysuit without having to make other adjustments.
It only has one because that is all you need and disconnecting two makes it more difficult to make sense of as it then becomes less recognizable as a harness that you slip an arm into.