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Interesting discussion , I'm just starting a mic build and I was wondering about the way the capsule could be /should be fixed. For suspension I was thinking of using a silicone sealant mixed with cornflour , the amount of powder can be adjusted to give the amount of flexibility you want and it also causes the silicone to cure fast even when it is thick.

But then I was also thinking that a capsule diaphragm is like a speaker cone , and those require a very rigid framework to operate against , and we add weight and stiffness to the baffle and the box to maximise that. So maybe a lead ring to add weight around the capsule and then a silicone support...

But if the best tube mics ever made do without anything like that , perhaps it's overthinking. And if capsules are made / tuned to give an appropriate frequency response with a normal mounting , some other kind of mounting may simply induce distortion.

I guess experimentation is the only way to know.