Full Disclaimer: I am not the world's greatest CW operator. Unless I can give it my undivided attention I still struggle. However, I am slowly improving and I certainly enjoy it.
Recently I ran across the web site for QRPGuys. They have some interesting items in general but one that caught my eye was their Single Lever Mini Paddle. It's intended to be built into a project of your own, a kit, etc. but one look and it just spoke to me. Actually, it said "hack me"!
The single lever paddle is a cleverly designed kit. It's made of some pieces of printed circuit board and a few common hardware items. It's small to begin with and best of all the cost is just $15.00US!
If you decide to built one of these read their very good directions and be careful to follow them. The kit is easy to build but I imagine it would be very difficult to unsolder the pieces if you hurried and made a mistake. Working carefully I spent about 45 minutes getting to the state shown in the photo above.
My idea for the hack, pun intended, was to remove the mounting ears where the paddles would normally bolt to the outside of your project enclosure. The small remaining paddle could then be attached to a clip board, top of the radio, etc. using a small square of velcro placed on the bottom of the paddles. The bottom PCB provides an adequate piece of real estate for doing this.
When you're finished you'll need to attach a connecting cable directly to the printed circuit boards to make your connections. As luck would have it I am out of small 1/8" stereo connectors so I have no photo of the totally complete setup. Here is a top view of the completed paddle. The main assembly is about 1" by 1" by 5/8" high. Total depth with the lever is about 2".
I hope this gives you some ideas of your own!