Make a West Germanic "empire" during the fall of the Western Roman Empire

Is there a way to unite most if not all Continental West Germanic tribes into a "centralized" Empire? It should be during the 470s during the last years of West Rome. It can be the Franks, Allemani, Saxons or Lombards, whatever tribe you want. Looking at a map the Empire would stretch from western Austrasia, the Alps minus Austria and Upper Bavaria, Czechia and the left side of the Oder-Neiße to all of Jutland. By centralized I mean like the Frankish Empire during Charlemagne. Bonus point of you can make it stay Germanic, like with an weaker Christianity.
 
I don't think this is possible. The Franks are probably the best candidates, but conquests on that scale to the east are beyond even them. Plus, I very much doubt you can reach levels of administration and centralization of Charlemagne at the time, especially since much of the territory you outline is still almost very much "wild" and far from Roman influence. Much less so without the influence of the Church, whose infrastructure and learning were crucial at the time and important for Charlemagne's successes as well.

Edit: And specifically for the Franks, there's really no incentive to try to conquer towards the East, when to the West you have infinitely richer, more developed and likely easier to conquer territories at your doorstep.
 
I don't think this is possible. The Franks are probably the best candidates, but conquests on that scale to the east are beyond even them. Plus, I very much doubt you can reach levels of administration and centralization of Charlemagne at the time, especially since much of the territory you outline is still almost very much "wild" and far from Roman influence. Much less so without the influence of the Church, whose infrastructure and learning were crucial at the time and important for Charlemagne's successes as well.

Edit: And specifically for the Franks, there's really no incentive to try to conquer towards the East, when to the West you have infinitely richer, more developed and likely easier to conquer territories at your doorstep.
Ok, what if the western land can't be invaded because the Western Roman Empire is stronger? It should at least be centralized enough that it can be called a land, like early france. Could it at least become a proto-Confederation like the German Confederation with the Franks being the dominant ones?
 
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