I have the same issue, blurry iron sights. Been looking for a new 1X scope cannot find one anywhere. Vortex and Sightron used to make one.
Vortex still shows it on their webpage but it doesn't seem to exist anymore:
V-Plex (MOA) Reticle | 1inch Tube
vortexoptics.com
looked into other sighting systems:
Aimpoint has several 1X full size scopes:
Purchase all Aimpoint® red dot reflex sights from the official Aimpoint Store. Trusted by hunters, law enforcement, military, & sport shooters.
aimpoint.us
Williams makes a special sighting system for muzzleloaders.
https://shop.williamsgunsight.com/ecommerce/p/western-precision-muzzleloading-sight-676584
I talked with a representative about it. The rear peep sight comes as a .150" diameter hole. It can be unscrewed and used as a ghost ring or three other sized peeps are available:
.125" .093" .050" The front sight is a globe with 10 interchangeable reticles.
As I understand it the correct sized peep hole can help with focus.
Are you struggling with your vision while shooting with a rifle in low light conditions? We have described how rifle peep sight can improve your vision.
rangerpointstore.com
Mk1 Micro SeeAll Open Sight
I know little about this.
Micro SeeAll Open Sight Our Micro SeeAll Open Sight is everything you are looking for in an open sight! Unlike other manufactures we leave the batteries out of our products,
www.seeallopensight.com