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Seems like an odd reply to your question.
Here is another way to look at this.
The crankshaft supplies oil to the rod bearings from either end of itself internally. It is the last mechanical part of your engine to see oil before the Rod bearing shells. Do you want to know everything about your engine before its re assembled? If so, then the reply above should not be taken into account. To me it reads like, don't bother leave it alone. Contrary to my statement.
But there are some considerations to be known.
Make sure you remove all the debris after drilling out the plugs. Otherwise something left in there makes the whole process no better than leaving it alone.
Do not tap the galley holes all the way. Make sure the set screws you use bottom out. Otherwise I cannot imagine to issue getting it out.
The early cracks have a really odd oiling distribution. There are 6 plugs I think from memory. The flywheel face has 2, 1 up the inside of the crank nose and 3 in cranks, #2 , #3, and #4.
Here is were it gets odd. The rear rod journal, (#3) and the front journal (#4) get direct oiling as the galleys intersect directly. Rods 6, 1, 2, and 5 are oiled from drilling that are tangential to the main galley drillings. Its common on these early cranks to fully groove the center main and cross drill it. It helps get a little more oil to the 2 center rod bearings.
As you get longer in the stroke with larger journals the angles of the cross drilling becomes better and more direct intersections.
Oil can travel from either end to either end. You can check this with compressed air.
Good luck and just make sure you remove all of the drillings etc.
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