Metallic fragments in the semi-destroyed OF are most likely your Camshaft
OR
Lower End Bearing Materiel ,as you already suspect.
You're gonna have to clean out all the Oil Passages,Head and Block
(The Block passages easiest is to knock out the passage securing Balls.)
[You may elect to thread and tap the passage ends(AND close off with threaded caps) rather than re-use the Balls]
LINK to "someone's" pictogram descriptions of ball procedure:
http://www.ps2cho.net/downloads/MB%20CD/W124/w124CD1/Program/Engine/602_603/01-130.pdf
The question of "Polishing" the Cam I can't answer.
if the Rings,Lands and Crosshatching survived y'all may be into a reasonable
rebuild.