I certainly wouldn't have a problem with Youngstrom - I think Slater was likely jipped on some postseason honors though, the possibility race came into play is believable given the times. His honors profile would be a bit better if that's the case. Can't we have both Slater and Youngstrom?
I won't mention anyone I've previously mentioned, but what about Gus Sonnenberg? Post season honors solid, won a title with Providence and a pro wrestler
Or Jim McMillen - Bears were in the mix every year and he earned postseason honors every year he played.
The 20s All-Decade team isn't great, so using it as an aid to id 2020 makeup candidates is more compounding an error than correcting one in my opinion unless they really want one candidate and just pick off Dilweg, that works, but here's what an old Bob Carroll article about the HoF 20s team, pretty much explains how it likely wound up to be what it is:
-selectors leaned heavily on men already enshrined in the Hall of Fame
-the scary part is that it looks like they didn't do much original research
-four men are probably in the wrong decade. Michalske, Hubbard, and Kiesling all spent more years playing in the 1930s than in the 1920s
-Mike and Walt are there because they were short on guards
-they shoved Ol' Jim into the '20s. That's nice for Jim, but it's hardly fair to a dozen or more backs who played better football during this era.
-By far the most striking feature about this roster is the number of coaching greats it holds. Count 'em: Guy Chamberlin, George Halas, Steve Owen, Jimmy Conzelman, Curly Lambeau all won NFL championships; Paddy Driscoll, Hunk Anderson, Walt Kiesling, and George Trafton were famous assistant coaches, and the first three had success in short stints as headmen. Even Thorpe, Nevers, and Henry were head NFL coaches. The natural question: were these all great players who became great coaches, or were some great coaches who were only remembered as great players?