Hmmm...If I remember correctly, IGA once said he had a game idea in mind that would explain why the Belmonts couldn't use Vampire Killer until 1999...
THIS has to be that game. The timeframe and plotline fits perfectly...
I like the "glyph" system...Two weapons at once reminds me of how SOTN worked(it had a similar system where Alucard could wield two weapons at once.) It also puts a bit of strategy into the hack and slash formula. I think that this could be as good as Aria of Sorrow was, if not surpassing it.