I may be in the minority but I like the look of the sights as they are. They have a practical looking aesthetic that is really appealing to me.
My own "plan" for getting an inexpensive double rifle involves reaming a 410 shotgun to chamber brass 410 shells loaded with BP and topped with a case bullet crimped as per a normal rifle round.
Then getting some rifled chokes made like and old paradox gun and maybe a custom mold to drop hollowbase bullets to help with gas seal?
No idea yet how to regulate it other then altering charge/bullet weight and I am sure I could easy dump more then $5k into it.
If I were a smart man I would start with modding a .410 Contender barrel first as proof of concept.
