Hard grit embedded in the dirt on the crankcase falling in to the oil pan would be my biggest concern.
Brake fluid is nasty stuff, could damage internal seals (swell to uselessness which could also dislodge them so they can block an oil passage) & is a little acidic which is not nice. Gear oil would be fine as long as it is not hypoid stuff, which is not compatible with wet clutches. Best to degrease the pan first.
Or bring the new plug along tomorrow, when she's belly up we'll change the plug before righting her?![]()
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