I currently use the front bead on both of my turkey guns. But, like you. My eyes are getting worse. I'd really like to get a Burris FF and put it on a Rem 870 youth, but they don't make a mount for a 20ga.
When they do...I will.
Drill and tap for a rail, use the picitinny mount, and BAM problem solved. You can also us the B-square mount if you don't want to drill and tap. I've done over 10 870 youth 20s this way.