I used a scissors jack, with a 2x4 block between the jack and the pan, to prevent damaging the oil pan. Not sure this is kosher, but it worked for me on my '79 K.
As you alluded to, and already know, be sure
not to put any pressure on the exhaust pipes as they will be crushed, Sports Fans!!!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII