I have 2 CPR bars (below the bar sux), both converted easy and cheap - posted details awhile ago when someone asked the same Q will try and find it.
edit - copy from previous:
This makes a fixed length throw, above the bar trim. So the first thing you want to do is work out how long you want the throw, I played with the stopper on the factory setup for a couple of sessions to work out my preferred length throw, measured it (wrote it down). When I did mates, his is setup with a "short arms" throw length - it's a personal length. The trim strap handle can be secured with velcro. The factory CPR has a hard tube and stopper ball on the end of the trim (de-power) rope, the ball is reused with the tube cut down to about 30mm in length.
Parts I used:
1. Cleat: CL826-11 -
http://www.clamcleat.com/cleats/cleat_details.asp?theid2=167 - this is available on-line, from a sailing shop like whitworths or even some kite shops might sell it. Pretty sure I paid about $18 each. Make sure you use the alloy cleat (there is a plastic version). This is the same cleat as used by Ozone and a few other manufacturers...
2. Velcro: $10 from spotlight gets enough to do more than 20 conversions.
3. small stainless screws - 2/conversion needed - 6 gauge x 1/4inch
4. home made handle for the end - 25mm webbing + loop part of velcro from above. I sat down and made 6 of these (in blue and some in orange) in about 20 minutes on the mrs' sewing machine. If you don't have access to a machine or someone who can do it, there are similar available online, try Switch Kites spare parts. Some manufacturers like ozone use a magnetic handle with a magnetic cover over the cleat instead of velcro.
Undo the current bar at the handle, remove the hard tube, stopper and handle off the trim rope. ** From the pics below you can see I also removed the throw length stopper to enable full movement of the bar (the cleat now acts as the stopper), if you are removing it, you need to feed the front line attached to the safety all the way through to be able to get rid of the stopper. with nothing on the end of the trim rope feed it back out of the bar and pulley (at swivel) - now feed it through the new cleat base and back around the pulley, and into the new cleat. Good time to replace the trim rope if it is a bit old - we are using 6mm double braid from the offcuts bin at whitworths (about $3).
** very important - the cleat position will determine the throw length, position it so the bar can move the length you decided at the very first step. Put the round stopper back on and slide it right up the rope, now (only hard part) slide the 30mm bit of hard tube over the rope and all the way up. Time to tune your lines to determine how long the trim rope needs to be and set position of stopper ball/tube/webbing handle - couple of good youtube clips on line tuning. The stopper ball should be over the tube as it is in factory fit and will be against the cleat when fully powered with tuned lines. Cut the trim rope at the end of the tube with a hot knife - soldering iron also works to seal the end. The webbing handle is now screwed into the hard tube (and rope) with 2 small stainless screws. Final step - glue the hook part of the velcro to the cleat, I wrapped it around 3 sides.
costs roughly $22-25 per bar. Hope this helps, between my friends, we have done this on 6 bars now. You can use parts from ozone or switch to save making anything, I made the handles because it was free (had the webbing) and a lot quicker than waiting for parts to arrive.