My Arabian Gelding uses a Hackamore and while I haven't mounted him since I purchased and moved him to our new boarding facility, he did well with it when I rode him before I moved him. I am looking to replace the hackamore that I bought from his previous owner and saw a few bitless bridals on ebay
that can be customized to your own specifications... either rope or leather. Might be worth a look. Its a hard decision.