He probably couldnt get that in the award as then it would give him ORD-CPH-ARN on SAS?
Either way, if you change to LH metal (check expertflyer for whos aircraft it is) you will get a cheese roll and a chocolate biscuit and be on an A320 instead of a 737.
IMO, dont bother changing your itinerary and dont expect an upgrade.
Good point about the Senator Lounge in FRA, its by far the best, but also can be quite busy. Lounge Dragons are straight out of the army i think.