The homebrew paddle that I pack with my KX3 is durable but weighs in at 2.2 lbs, a heavy weight by any standard. I finally looked around for a lighter weight replacement and found the Palm Pico Paddle. At only 1 oz this one will certainly pack easier. I've now had a few QSOs with it and I couldn't be happier. This one works fine and will pack along on my next hike a lot easier.
The Pico Paddle comes with a magnetic base and a cord for connecting to the KX3. The size is perfect for the right hand side on
the KX3, fitting just below the right hand endplate mounting screws and
above the antenna connectors. Elecraft does recommend a right angle plug. I
found one at Radio Shack. Palm Radio offers a steel KX3 endplate that works with the magnetic mount, but not one with handles. Instead I ordered a piece of steel that sticks on the KX3 endplate to provide something the Pico Paddle magnetic mount will stick to.
Phil Moorey has a good suggestion:
Addendum, Feb 6, 2014
After seeing Phil's suggestion above I was motivated to return to my local big box hardware store in search of a different stand alone base plate. This was to be used only in the shack so weight was not a big issue. What I found in the plumbing department was a 5"x8" 16 gauge "Steel Safety Plate". I then located soft rubber non-skid "Gripper Pads" designed to stick on the bottom of table legs to keep them from moving. I now have a base for my Pico Paddle that works great at the shack operating position.
Addendum, Apr 21, 2014
The only problem I have is that I tend to be heavy handed
enough that I can loosen the paddle from the KX3 when it is set up with
the magnet on the side. For me I'll probably leave the magnet on the bottom
and pack along a piece of flat metal (like a 3 1/8" x 7" steel joist tie
plate) to use as a base out in the field.