There are several possibilities that have not been mentioned. Since I have had to wear trifocals for the last 20 years since I was 58 I have had some trial and error experience.
The peep especially the larger hole types will work for a back sight what I ended up with for a front sight on my competition gun was a shaft with a donut shape on top used it to center the target since you look through it instead of at it the blur was eliminated.
An other possibility is for hunting that is the long focal scope not the pistol scope but the rifle scope made for top ejection cartridge guns the pistol scope can work but you have to mount it so far forward it makes it difficult to find your target.