Test prototype for a velcro-based chestrig, distributing weight on sides, is ready, while quick-ditch buckles are not available for me.
I made (from leftovers) a base for a rig, more advanced than usual rapid-open buckle adapters for a plate carriers mentioned in concept post. Below: left side not assembled yet, right side assembled already.
Mesh pad become mandatory, to hold pieces together.
Center pouch will be ifak pouch, easily removable via hook&loop.
Due to lack of hardware, I had to make an adapter in place of buckles:
This adapter holds any pouch, in this example it will be phone pouch, but ammunition pouches are best to put their weight on sides.
Side buckles sit on a special adapter, shown below.
These adapters could be used with rapid-opening hardware available, instead of the ones attached to the sides of chestrig currently.