A hirschfanger named Marie

[A Senefelder]

Not impossible; people of lineage fancied mounting their ancestors blades in their present swords

Actually Fernando, the similarity between the blade of the katzbalger on the right in your pic and the one mrwizard posted are substantial. The fullers of wizards blade running through the tip seem to indicate as he said that it has been reshaped. I'd say theres a chance for your idea of a rehilted kat blade being at least possible.