I could see DHS trying early EMHs again.
The one time they did it, I think part of the confusion was because they announced BGs would be available at official park open, instead of as people tapped in (which is how they were doing it in the early days), but then made them available 20 minutes or so before the official time with regular boarding groups running out before regular park open.
Now that the expectation of BGs available exactly at park open is better understood and with
Disneyland having done Magic Morning with Ride of the Resistance not available during it, I think the pieces are there for them to try EMH in the morning at DHS (assuming RotR would continue to not be available during EMH). For example, they could hold off site guests for a couple of minutes in the holding area after open, to allow off site guests to try for BG and then let them go.
Will be interested to see if they'll move the April EMH or not.