I respect the DC baseball history fans too; I think that your suggestions are great (but I am obviously biased).
I was very happy to see the Montreal logo with Carter/Dawson/Raine's names at Nats Park, so I think that's enough for now. However, I can't lie, I would love to see another Expos-uniform game like the one the Nats played in 2019.
Agreed about the names being put up there at the ballpark, I think that’s a sufficient way for things to be handled for now. I was there when Dawson came for his ceremony, and that seem to work fine. As there don’t figure to be too many more Hall of Famers coming from that crop of Expos rosters nor the old Senators rosters, time seems to be taking care of that.
It would be one thing if Washington didn’t have a baseball history before 1969 that has limited ways to be recognized as it is. With the team back, it makes a lot more sense for throwback things to be focused on the old time Nationals/Senators here, especially since Minnesota and Texas now have over 50 years of baseball history they can recognize with throwbacks etc.
I think the better teams to carry the history side for the time being are the Canadiens and the Blue Jays. I seem to recall some Expos player recognition things happening at the Bell centre since the move, and that makes sense because many from the fan base when those players were active can still enjoy that.
The Jays are the team that has been willing to come over for the exhibition games that they’ve had recently, so that seems a natural fit. Further official baseball-specific recognitions might seem well-suited to occur there, including an alternate uniform day from the period before the blue jays existed. I think that would be something that could work for everyone involved.