Have you considered Trialcast levers? They may be exactly what you want. To quote the website "Trialcast Beta levers are cast from high silicon LM6 alloy. LM6 offers a higher degree of elasticity than other cheaper alloys. This unique physical quality enables the lever to bend rather than break, without compromising strength. Will fit the 200, 250, and 270 in the '05 range, and all models from 2006 onwards."
See http://www.trialcast.co.uk/product.php?id_product=38
I can't comment on the levers, but the ghost pegs and hangers have done my Betas very well.