See if you can find a Beneteau group online, maybe they could help. Or, continue your search, but make personal contact and keep asking for referrals where someone in the trade
might know could help. Ask at the places that advertise in replacement toerails for older boats. I sympathize with your desire to keep the taller ones, it's easier to brace against. Or, replace both toerails, and order the mods you need. Or, have just one custom made. I sympathize with your desire to keep the yacht looking shipshape, but maybe you could learn to live with it if it isn't all torn up.
Good luck finding a solution that will work for you.