I'm in the same boat trying to figure out how to make Lineage work on an M1 iMac.
 

Did you ever get it to work? The closest I got was CrossOver which launches up to the character selection screen but the screen is all messed up (5…

Is there an NPC in game that converts Lumps of Metal to Lumps of Iron?

According to the old Lineage DB, it should be Joan in Giran (loc 33470, 32777), but that NPC is not there.