The bleed holes arre easy to clear with poking a drill bit or screwdriver or down each hole, there about 2" deep from memory till they bottom in the oil gallery.
It won't be swarf, but more powder like aluminum bits from porting, these won't block the oilways, they find thier way down ,and score the f**k out of the oil pump instead, as pick up strainer too coarse to stop these, head should have been cleaned after porting, before being rebuilt with valves etc.
You can certainly do as you suggest, it will do no harm, so long as oil drain back hole is well plugged.
tabetha