If you don't like a front sight filling the rear gap you're sighting wrong. Your rear sight should be barely visible / barely noticed. Front sight focus is what combat handgunning is about.
You're overthinking it.
If the gap fill is distracting - file out the rear gap to open it up or use non-NS rear and NS front.
JYD #123 The great one formerly known as Architect.
I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.