I agree with the others, Graham. Give the cabanes a go. Just pretend that you're rigging the cabanes on a 1/72 scale SPAD.

I know that you'll be much happier with the results if you do. I'm really glad to see that you've sorted the boom issue.
Cheers,
Bud
Going back and looking at your photos again, I think what I would do, if this were my build, would be to use very light gauge high E guitar string cut to the exact length, with a drop of glue on each end, laid in place with a pair of long tweezers. Very little likelyhood of colateral damage that way, I think.