OR, you can make this WHOLE argument moot by using a smaller peep, and shooting with both eyes open.
You can use a " peep eliminator" if you need more help with your form...but most importantly, with a small peep, and BOTH eyes open, you can see your target, AND your sight in perfect focus.
If you have fiber optic pins with a light, you can even shoot in near TOTAL darkness. Basically if you can see your target, you can hit it..
Your peep sight IS your rear sight...and gives a MUCH longer sight plane than the peep eliminators (save for the " No-peep" but that one takes your eye off target). A SMALL peep keeps things in focus (take your glasses off, and look through a target peep sometime) It isn' t small to make it easier to keep the pin centered, but to aid in focus.
Your NON dominant eye simply has to look at the target.