Might want to look for billB's techno site, and look up what rumbleseat (Paul) did to his 34. Not exactly as you have asked the question, but I believe there is enough info there to answer. As I recall (never trust my memory), I think he used a 46-48 rear end with Columbia, to create for his 34. I think he kept the 34 bells (with Columbia added), so he could also keep the 34 curved spring with its mounts. If memory is correct, he used the later banjo, and probably 35-41-style axles, with mods because of length. I think the bottom line is that the combination of correct bearings will accomplish what you asked. Check it on the techno site. Or, if his writeup can't be found, I will look for a copy - I've got it here, 'somewhere'... Or, better yet, just ask Paul (through the barn, or through billB/techno)
JMO