This is a 1 piece design. I don't know where you got the 2 piece from.

There is plenty of meat there for this to perform as intended and current
rear calipers on more powerful bikes are nowhere near as bulky as this
so I feel you're either out of touch or just plain wrong.

In any case, I'm looking for an engineer to work with me on this, not just an operator.

I'm only precious about the aesthetic, the engineering can be tweaked once the job is agreed.