Bill: First, how much il is it leaking? Is it a stain down the side of the case or a flow onto the floor with a few (or more) drops each time you shut it down? Is leaking more than a quart in 2K miles? If not, then leave it alone and live with it. If it is, then keep reading.
It's honestly not that big a deal to take it down that far. OK, so there's a lot of peripheral stuff to remove first, like the cooling shrouds and alternator/generator and then the head(s), but that all comes apart in a few minutes. Get a good rebuild book like a Haynes or Bentley shop manual or "How to rebuild your Volkswagen Air Cooled Engine" by Tom Wilson and do what they say.
When you get to the part about removing the barrels, DON'T REMOVE THEM ALL THE WAY!! Just turn the crank by hand to run that piston all the way out, and push the barrel out just far enough to clear the case, then check the flange and case for cracks (just in case).
Clean the flange and case opening really well (I use a very light abrasive cloth on the case), then goop the flange up with Permatex blue (use your finger and run a 1/4 inch bead around the flange where it meets the case - there may be a spacer ring there - goop both sides - top and bottom - of the ring) and push it all back together without letting the piston rings get loose (not good if they do). Then go to the next cylinder and do it all over again. Then decide if you want to do the other two cylinders or leave them alone (your call). Should take you a Saturday afternoon if you don't really know what you're doing, but the hard part (getting the engine out of the car) is already done. Just go slow.
Again, if you decide that the leakage is not excessive, then live with it - LOTS of VW engines weep oil a little and they keep on going, and going, and going.......Kinda like old Harley's.
gn