Oil leak behind the cam

Righty Tighty said

I think I can reach far enough to engage the drill motor and turn the crank at the same time.

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This is missing the point. If you turn the crank while priming, you will not ever see the oil to the rockers. In a non-running setup, it takes that 20-30 seconds to see the oil when the crank is stopped in the right location(s). Stopping the crank in fixed spots is not for convenience; it is to have any chance of seeing the oil coming out of the rockers.

70aarcuda has given you the shortcut in post #34. If the cam it drilled with the correct indexing, then this will save you time in finding the right spots. In a very few cases, however, the cam's oiling holes are indexed incorrectly. So then you turn 15* at a time and prime....and keep doing it over and over.