Colin I had one of these http://www.sax.co.uk/acatalog/P.Mauriat-PMB-300DK-Low-A-Bronze-Baritone-226136308.html Problem was the fact all one side of my left hand went numb from little finger to middle finger. It took a good few sessions of physio to sort out..So I don't want to go down that road again..
I've been playing bari for nearly a year, now, and I'm still finding it difficult to find a comfortable playing postion, especially standing. It's not easy to get the weight nicely distributed without having to bend one or other of my wrists back which is uncomfortable and restricts finger movements. It seems to help if I angle it across my body more than I used to, but then I have to bend my head forward to reach the mouthpiece as my (personal) neck is quite long. Tips, anyone?
I hang mine on a wide dog lead sling and for standing have it quite high. I push it into the "down the side" marching tenor position with the right hand thumb rest and adjust the neck and twist the mp so it's right there in the mouth with the head up. The bari is a big old lump needing quite a bit of manhandling and I can understand why some prefer to sit. I did see Harry Gold stood on stage playing a Bass when he was in his 80's. I was impressed in so many ways with his performance.