hahaha, not funny j/k ;-) Which weight are you talkin about? Stock Ospreys don't come with weight, they just come with the harness and a hook with a split ring on it. The pro rigged Ospreys at BWW have a weight in em to keep em running straight. As for the Roam Minnow, now that thing has some weight. That's one heavy bait. Different bait, different company, different weight. That thing's like solid lead inside just about... As for the snap swivel problem, that's a tough one. Just about anything you do involving a snap swivel above the head of the bait will inhibit the bait from sliding up the line (which is bad). So, if you could rig a snap underneath the bait, like right on the treble hook, that would be the only way to go. What you could try is eliminating the split ring that's on the pro rig, and just snapping directly to the treble hook. If you snap to the split ring, it'll probably be too much junk underneath there and it could screw up the hook placement on the bait and whatnot. The problem you're going to have is with the swivel getting stuck in the tube because it's not as wide as a split ring. I know chris puts a metal washer right there on the underside of the bait where the tube comes out, but I usually don't bother. It'll probably work fine as long as you have the washer there and the swivel isn't small enough to stick up through it. If so, you could always get a smaller washer.

Now, the downside to this is that you still have to cut your line to retie and can't just unsnap. Kind of a catch 22 there. Let's see......... Maybe you could actually go with a smaller snap and a larger tube so that the snap actually does slide fairly freely inside the tube. That would let you pull the swivel through the tube, and then snap onto the split ring, with the swivel still up inside the tube, know what I mean? If you can deal with the smaller swivel and have confidence that it'll be strong enough, that's probably the best way to go. Either way it's gonna be a pain in the @$$. Putting a swivel up the line a few feet from the bait would be easiest, but it would probably cause the bait to screw up. Mess around, I'm sure you'll get something to work for ya.
-Brian