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The alignment and distance between the shadow mask, phosphor dot plate, and the gun+neck makes this really difficult (~expensive) unless there was/is another tube that used a bell identical to what was used originally without provision for the flange.
The path of stabilizing the ultor flange seal is likely the best way to go.
The bottom line is that the designers at RCA had to make the best of what technology and methods they had at the time.
I'm sure the engineers at RCA would have never imagined that these tubes would be in use some 55 years on.
I'd be curious to see how many modern CRTs will survive 50 years with a vacuum intact.
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