Wow. Don't see many Denmark-screws.
It's kind of limited what's left to screw, considering OTL. Still, I wouldn't actually call that a Denmark-screw. Losing Norway is OTL, and the rest aren't really big deals. Greenland is just a drain on the coffers (not that I begrudge us sending money their way in OTL, considering that we did muck things up in the first place.), and I doubt Iceland is of much use either. As far as I know, the Danish West Indies weren't that profitable either, so losing them to Sweden isn't that big a deal.
At the same time, Slesvig has been separated from Holstein it looks like, which might just mean that Denmark keeps the whole thing. Especially if a desire to regain lost ground on the outside means internal "expansion" and reform. While Slesvig was pretty much split in two in regards to language, it should be possible to make the whole place generally Danish if an effort is put into securing the "frontier". Considering the other losses, that doesn't seem entirely unlikely. The Danevirke border was almost mythological, so the thought of "the enemy" being on this side of the fortifications might convince the Danes to attempt to assimilate southern Slesvig. Obviously, you do have the problem of the Germans having a giant state to the south that will probably intervene if the Danes are too forceful.
Perhaps this much reduced Denmark would get a guarantee like the Belgian one, to ensure that no power took it over and got the ability to close the Baltic? A largely anti-German policy to be honest, but it should be in the interest of both the British and the Russians. In return, Denmark should only follow a policy of well-armed neutrality. Of course this doesn't have to happen, but I don't thinks its entirely unreasonable.
So yeah, all in all this doesn't really have to be a Denmark screw. In time, when the EEZ* have to be defined, you have a pretty good shot at the Danes getting a better deal than OTL as well, considering the OTL deal greatly favored Norway. At which point you have a slightly larger Denmark than OTL, with no overseas dependencies to send money to and more oil than the Norwegians have in OTL, while having spend the last 100+ years reforming and restrengthening the nation from within. Sounds alright doesn't it?
I guess my point is, losing territory doesn't have to be that bad, particularly not colonial money pits. Especially if this loss then leads to reforms back home.