That's a bummer if one did fall in. Don't turn the motor over until it is retreived, else it may become hopelessly lodged in a bad spot. You have a good chance of fishing it out with the magnetic tool though if you're carefull. You can also drop the entire oil pan and see if you got real lucky and it went all the way down.
If not, you can actually lift and flip the bike over and shake it if you have access to a good motor hoist and some good cloth straps. You've already got about 100 pounds off of her, both wheels are also heavy. It would probably be about 300lbs by the time you get everything stripped anway. Not to heavy to be askert to flip her over. Just don't try it by hand, you do need a secure lift.
That may sound extreme, definetly a last ditch effort, but it beats the heck out of splitting the cases apart.

A word to the wise is not necessary. It is the stupid ones who need the advice. Pat