Yeah like the DVNP and the rest of the parties would accept a Habsburg Kaiser.. And now it is 50/50 on the new constitution, anything can happen, especially with the DAP in this strong position. Face it, your dream of a Habsburg monarchy will never suceed, since the coalition is so split on every matter. DZP want a liberal-democracy, DVNP want an absolute monarchy, DAP want a totalitarian state. DZP want a Habsburgs, DVNP Hohenzollern and DAP a Führer. DZP want rule of law and liberty to a certain extent, DVNP and DAP are highly racist.. DZP want to have equal representation and greate autonomanacy to each state, DVNP want Prussian dominance and DAP want Führer dominance.
And the list goes on, you're simply too split. In order to get a constitutional monarchy, you will have to make many concessions to the DVNP and DAP. Or you have to sell your soul in order to get a Habsburg on the throne. Either way, you will have to make lots of concessions and things won't be as pretty as you picture them.
But on the other hand, if you host a congress in Berlin, you might show resolution and leadership, and even please the DVNP and DAP (and maybe DZP-R and DDP) by getting old territories back, establishing stability and re-creating a colonial empire. Who knows, that could help your cause. And of course every colonial empire need an Emperor
This is the thing: the reason the Papenites and liberal monarchists won't succeed isn't because of the DNVP nor is it because of the DAP; it's because of the moderates: Zentrum voters, FVP voters - hell, DDP voters even - it's time to descend from your ivory towers and face reality: which would you prefer, an autocratic republic or a democratic monarchy? There can be no fudging nor mudging on this issue: either you are for a democratic monarchy or an autocratic (or socialist) republic.