The Mirage Drive used to use billet aluminum crank arms with left and right threaded bicycle type pedals. I have them on my old Drive.
They are no longer listed, but I'm fairly certain the factory still has a few left. The old part numbers for these cranks were 81100 (left) and 81105 (right). New # for the left is 81220001 and I don't know the other #. These will add about a pound to the Drive but should fit current Drives (they might need a small amount of beveling at the bottom tips with a file to fit the newest drums).
Pedals are not included; you would supply your own bicycle pedals to suit. Have your dealer call Hobie to verify availability and pricing. If your dealer tells you they are no longer available, have him call anyway.
If you go with the clipless pedals and shoes, remember they take up a little extra space so make sure your not already using the #7 hole!
This is not the greatest picture, but shows the old style left crank and pedal shaft on the left, more recent design on the right:
Regarding your current pedals, you can remove any lateral slop (if any) by removing the plastic end-cap and adjusting the 7/16" (or 3/8") nut.