I'm in my mid 30's. I agree that switching younger is easier thanks to neural plasticity, but I don't see any reason why one could not switch later in life with the right attitude.How old are you?
I'm not being a smarta** but switching at a younger age is easier.
I think wing shooting is most critical for shooting dominant eye. Scoped rifle is probably the least.
It seems that the jury is still out on shooting dominant eye in archery as an absolute requirement to be accurate. The target is stationary and consistent form and shot execution is the key to accuracy. If you can do the exact same thing every time then the arrow will go to the same place. Legendary Olympic archery coach Kisik Lee is a proponent of shooting dominant hand because of dexterity issues involved in the release which he feels is the key to accuracy (shooting Olympic recurve with a finger tab at 70 meters)
Based on the percentage of cross eye dominance in the general population you would think there would be more than 4 left handed Olympic archery medalists since the 1970's and exactly zero left handed competitors from Korea, the ruler of international archery.
I agree with you that consistent form and shot execution is key to accuracy. The difference in my experience is how much mental bandwidth goes in to forcing your non-dominant eye to be the primary focus. It feels like constantly fighting your brain. Using my dominate eye felt like relieving a massive mental burden that I could apply to execution.
One could argue that many archers with the potential to become Olympic level never switched and fulfilled their potential. I would personally never have been able to shoot past 50 yards if I stayed with my right hand because I could not shrink my groups. Activating a release imo does not require a ton of dexterity, just consistency. If there was an Olympic sport of using chopsticks, then by all means...
In Korean (and Asian) culture, there is an old school stigma to being left handed. Often parents would forcibly change their children to become right handed. I think that often screws up a child's coordination because they are learning everything with the wrong side, even if they eventually become proficient. Then there is a matter of coaching. I guarantee every Olympic level coach in Korea is right handed, right eye dominate. Shooters are competing with the best of the best out there, so a cross eye dominate shooter just would not make the cut out there. Left handed shooters probably do not get the coaching or recognition early enough to become world class.