Luxembourg main focus tree:
1) The Return of the Grand Duchy; "For too long, our nation has been abused by its neighbours. Since our independance at the end of the Thirty Years War, we have lost close to 3/4s of our rightful land, we shall make sure that our rightful land is returned to us" effect: add claims on Belgium, Germany, and France
2)a) Our Western supporter; "The British and the Netherlands have on a few occasions helped our nation recover, let's see if they will do it again for a rightful cause." effect: improves relations with GB and the Netherlands, GB and the Netherlands get an event to choose between a alliance, a guarantee, or nothing with Luxembourg.
2)b) The Northern Sword; "Sweden has proved its might during the Thirty Years War, and with our information on western models the Germans have been showing on our borders, they might prove to be a valuable ally" effect: improves relations with Sweden, Norway, and Denmark. Sweden, Norway, and Denmark get the same event as GB and the Netherlands would have if 2a was chosen. The countries, upon choosing to make Luxembourg an ally or guarantee it, get an event which increases their medium armor research by 25%.
3) The Belgian usurpers; "Belgium was the last nation to steal sovereign land, and also the weakest. Our allies combined pressure might be enough to cinvince them that it would be in their best interest to hand our land back" effect: All allies and guarantees get an event to either support the claim or not. Belgium then gets the choice to accept the demands or go to war with all supporting allies and guarantees
4a) The French question; effect: France gets the option to grant the land to Luxembourg (it's practically nothing and undevelopped land, so it's not like they need it...) or face a similar fate as Belgium.
4b) The German threat; effect: Germany gets the option to grant the land to Luxembourg (more developped although still not much, war is much more likely to happen, probably the way to start in a bang a good European War) or face the supporters.
5a) Reconiliation of the West; effect: France can allow its claims on the lost land to lapse and join as an ally of Luxembourg (in effect every ally is part of the Allies)
5b)i) (End of the European War event aka after the war with Germany is won) Our Ancestorial Claims "Luxembourg was made by Karel de Groussen (Luxembourgish name of Charlemagne), and now the opportunity is open to us to reclaim his lands for our nation from Germany." effect: territories from Trier to Koln ad back to Luxembourg is taken by Luxembourg no matter the peace deal
one or the other
5b)ii) (during the European War) The War of Anhiliation effects: improve logistics and manpower gain, improves infantry research (25%)
Pretty much continue down the path of territorial expansion to the point of making Luxembourg a European Power, at the expense of the Netherlands, Belgium, Germany, and France in order to make an Empire.
What can I say, I'm a revanchist Luxembourger, and a stern advocator of grand military manoeuvres...