You'll keep the stock linkage and motor with either type. It's just the plastic factory cover that will have to be modified or left off with the Rampage/STC/Kayline type with the drop bracket.
That's because the "drop" bracket is also a "flip" bracket, where you flip the motor 180 degrees so that it's mostly on the passenger side now. This necessitates cutting a hole in the side of the cover (like I did) or buying a longer cover specifically for that (
http://www.wildhorses4x4.com/product/LongWiperMotorCover) or not using one.
I like the cover myself, so wanted to keep it even with my Kayline top.
The fit of the bikini tops has not changed much (if at all) in the last 45 years or so.
Because the tops, in their simple forms, attach to the windshield frame then stretch back to be supported by a standard-ish type interior roll bar, they necessarily taper inward towards the rear.
This means that the door frames get left out in the wind so to speak.
That's a bikini in it's simplest (and most affordable) form. To seal against the doors you'd be talking about extra bracing, not only along the side at the top of the door frames, but back at the roll bar too. Along with a new attaching method at the rear most likely too.
Not sure if anyone has redesigned the wheel yet, but at that point you're talking about doubling the price at least, and making people think more in terms of running a full soft top in safari mode (side and rears out) instead.
We have not had much demand for such a construct as far as I know, but we do make custom bikinis to fit other criteria of individual Broncos. If you come up with the braces and such, we could make a top for it.
Paul