I'm not sure how pigeon-holed we actually end up being. I've only spent 30s, but there appear to be less than 20 players in the NFL under 5'10" right now.
I'd be willing to relax the standards a bit, but that requires identifying such a return man and being able to get him AND having that identified player happen to be under 5'10".
Considering both the height (5'10") and weight (~190lb+) thresholds we have typically targeted... Looking at all of the "above average" punt returners in the league (i.e. qualifying players who average better than league-average yards per return)
12/16 of such players are either right at or below our preferred threshold height and/or weight:
Marcus Jones - CB, NE -
5'8", 188lb
Marvin Mims - WR, DEN - 5'11",
182lb
Rashid Shaheed - WR, NO - 6'0",
180lb
Isaiah Williams - WR, NJY -
5'10", 185lb
Jaylin Lane - WR, WAS -
5'10", 196lb
Parker Washington - WR, JAX -
5'10", 204lb
Malik Washington - WR, MIA -
5'8", 195lb
LaJohntay Wester - WR, BAL -
5'9", 170lb
Skyy Moore - WR, KC -
5'10", 195lb
Greg Dortch - WR, AZ -
5'7", 180lb
Kameron Johnson - WR, TB -
5'10", 170lb
Ke'Shawn Williams - WR, CIN -
5'9", 188lb
As it stands, our smallest rostered WRs by height are either Golden and Reed (both 5'11"). By weight it's Reed (187lb) or Keeney-James (190lb). At CB we have Nixon as our shortest at 5'10" (200lb) and Jaylin Simpson (6'0", 180lb) or Carrington Valentine (6'0", 189lb) and Bo Melton (5'11", 189lb) as our lightest.
There are also 29 qualified KRs who logged a better-than-league-average yards per return. Now to be fair many of these are also the same as on PR (I. Williams, R. Shaheed, S. Moore, M. Washington, M. Mims, G. Dortch) but can also add in the following who also fail to exceed either or both our height/weight thresholds (I'm also removing guys who are RBs outside of ST duties as I think that's a whole different thing, haha. There are about 8 of those players who are predominantly RBs):
Tom Kennedy - WR, DET -
5'10", 195lb
Brandon Codrington - DB, BUF -
5'9", 185lb
Tyquan Thornton - WR, KC - 6'2",
185lb
KaVontae Turpin - WR, DAL -
5'9", 153lb
Now don't get me wrong. I don't think all of these are necessarily "rosterable" players (and in fact not all of them currently ARE rostered, as best I know

). but I guess in looking at that I would conclude that...the general size threshold for having an above-average returner seems to skirt awfully close to our minimum threshold for WR or even CB usage. So on one hand I don't think we really need to go hunting for guys built like Turpin (I wouldn't necessarily rule it out either) but if the smallest we want to go is guys sized like Golden or Reed (and that seems to be our bottom-end for size) i could see that being a bit limiting for us
BUT, with all that in mind, it's just a bit of a thought-exercise for me; I'm still not entirely convinced it's solely (or primarily) our returner (KR/PR) themself/themselves who is the biggest blame-factor for our below-average return game, and I'm not convinced that throwing a smaller and slightly more nimble guy back there would materially change much.