I know how you feel. My qh goes in 5 1/4 + must be eggbutt, so it was a pain to find one right size, right metal, right mouthpiece + eggbutt. In your case I'd keep looking personally. I'm sure you can find something out there this size in configuration you want (just may take some time). Look into used ones too: if they made them, there is a good possibility someone is selling one.
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."