The big iris is probably the most practical thing for smaller lenses.

If they are bigger lenses and you have a flange or something to permanently mount it, it's a good excuse to buy more tools for woodworking. I've got a pretty good collection of hole saws now.. I started with a hole saw kit and quickly found out the hole saws are not useful sizes, so I've added quite a few to my options. If you can provide a normal lensboard such as a 4x4 if it will be used with a graflex for example, it will make lens usable to a bigger market when it's time for it to go to it's next owner and perhaps add value.