Rather than try to get all the inscriptions possible in your reach (mission impossible!) maybe you should probably start classifications with relevant examples like these:
Maker's mark: ex: Tho. Kapustran Transylvania fecit
Mottos: In nomine dei / Firch Got und lieb
Owners mark: Carolus, emperor Franciae /
Timeline mark: 1784, MDCCLXXXIV
Poetic marks: ...
And so on ... And most important remember: the Medieval sword inscriptions have not only been part of European continent. Asia has some of the most amazing armorial scryptures from the Mughal Quran versets, to the Arabian prayers, to Ottoman tughras to Japanese swordsmiths marks and the list is open.
I think you have chosed a great project subject and I have the certitude you will end up having a lot of joy doing it !
Wolviex, my dear brother, I hate you for all the acces to knowledge you have !