Tyvm
The "Chasers" could be the original people who created the Keyblades.
The things required to make a keyblade complete are:
The metal shape
(An optional enchanted keychain to give it more power)
And a spell to empower the keychain with all required abilities.
Also, when people first started to fall into darkness, the people who tried to protect the normal people must've created the keyblade, to give the keyblade the properties it already has, and the ability to lock keyholes/ destroy heartless + nobodys.
I got way ahead of myself on that last paragraph...
keychains, change the shape of the keyblade. was basically what I was trying to say.
The Organisation could be working with "Chasers" there ancestors or relatives could be "Chasers", or Chasers could be, actual Organisation members (n0t k1ll3d 0n3$)
Maybe Chasers can actually modify or control the keyblades:
birth by sleep...
Maybe the keyblades were made from dreams?
On the theory that keyblades were invented to help the people and save them, all their dreams could have created a keyblade.
Once more getting ahead of myself
But I want BIG rep from everybody reading if I was right and if this thread lives for a few more years until KH3