Thank you Boffer for sharing your work at this point.
I nodded as I read it but had questions at various points. The following remarks are just from off the top of my head.
1853 Garrard ledger page, for the QV RC, shows that it was to be in a variety of forms. Alternate sets of elements.
I thought the largest Cumberland was replaced by a cluster.
At least the Oriental and QVRC were left by Queen Victoria to the Crown (Twining).
If you identify the two latest crowns of queen consorts as circlets I think that is wrong to do. Unnecesary and highly likely to confuse people. Perhaps I have misunderstood what you have written. But I think it is inconceivable that the Queen would ever consider, for one moment, wearing either of those crowns, without their arches.
And I am interested to learn your sources, in due course. I don't always agree totally with conclusions you draw. And do you have the work by Judy Rudoe on Queen Charlotte's jewels? I might have to read it again.