Investiture doesn't work here-it's mana or nothing. (Besides, I think you just used cosmere buzz words, Hemalurgy spikes dont make good daggers)
You can get magic daggers, sure, that let you cut memories and glow when blood is spilled.
You have Sacred magic- what do you want it to do?
I'm hesitant to allow any cosmere stuff (it's, not after all, generic.)
I'm torn. If you really want to you can play him (like if you wouldn't play if you couldn't play him), otherwise, I'd request you make a different character.
Yeah sure, curses and fire magic.