Hullo Jean,
As explained in post #2, sandang walikat= gird over the shoulder.
Alan,
I don't see it as a dialect. It was designed to facilitate communication between confederate officials from the capital and regional officials from any part of the kingdom.
If you insist on a name for it, then it is: Basa (Soenda) Jero. Probably a bit like Kromo Inggil&Madya.
Best,
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