I wanna thank everyone that posted and commented, it was very helpful.
Now I'll gonna tell you how my GM and I solved this problem.
We agreed that the most practical method was to refine orichalcum, shape it as the desired weapon (we are probably going to make a short blade or knuckle) and attach a exotic telesma (metacritter body part, as a dragon tooth) to ir as a mana source, my shaman and the NPC mage of the group think that
might work.
Last session my shaman and his pal mage spend a
month in their brand new Micro Alchemical Lab refining (Breaking Bad feelings...), we've ended with 10 units of radical orichalcum ready to start the proccess. The expenses was near to 90.000¥ to make 500.000¥ in orichalcum (good deal

) and a month of hard work.
I'll keep posting to show you what came out of our little magical enterprise!