The easiest, and least messy way is to use a large syringe with some flexible medical tubing. Remove you fill plug and pull out the desired amount of oil. Works like a charm!
If you know anyone in the medical field, ask them to grab you a 25 or 50cc syringe and some tubing while they are at work. I keep some old syringes around just for this purpose.
Option two is to drop your belly pan, and open up the drain plug. Remove the oil, until your about 1/2 way, the re-top off.
Needless to say, with option 2 oil gets everywhere and makes a mess. But well worth the peace of mind. I keep my 2003 K1200RS at the 3/4 mark.