Would the coolant mix with the oil or would it separate in globules?
When not started it’d be a seperate layer on the bottom of the sump.
After starting it’d emulsify which would reduce the bearing capability of the oil until it evaps off – no high RPM action, keep the revs around 1500 until the engine has been roasting for half an hour or so – a 50mph motorway cruise would do it.
Evaporate it off, eventually.
When you then shut down would the coolant (heated) sit on any seals etc?
Possible it’d sit in the bearings, which is where the problem lies, so a long run would be important to ensure none was left in there. As I say, condensation occurs within the engine as a natural course of the heat cycle of the engine, but 100ml (as we now know) is way too much to drive with, with this info I’d want to drop that oil out now, no question.