It sounds like Robert is keeping his lines quiet: it's the battens that are causing the noise. Another thing that works well, Robert, is wrapping cheap rope around the battens. No squeaking and it softens the banging, too. Black alkythene is hard, long wearing but might bang. Polythene tubing is great, but quite expensive (so is the alkythene for that matter), but, as David says, subject to UV degradation which makes it go sticky in the first place. Not nice. I've used fire hose in the past, quite successfully. If you're prepared to put a wee bit of effort into the issue, closed-cell foam wrapped in slippery cloth would work well. (The closed-cell foam is not very robust on its own.)
I hope that you are going to write up all about your conversion and how you find the rig, for the magazine. She sounds like a lovely boat.