Pelhams
My Welsh D used to have a ported bar Pelham and it was enough to lift off the tongue. I am not a single jointed fan either, but all mine have been natives so they dont suit mine. The one thing with bits, every horse has their own likes and dislikes if yours like the single joint and gives no worry, then it would be worth trying a jointed pelham, not so much new to get used to. There are a couple of places offering Bit trials, that might be the best thing to save money, or see if anyone on NR has what you want lurking in their tack rooms! Perhaps NR should set up their own database Bit Bank, I am sure between use we have them all.