I’m currently using the programmer Dvorak layout by Roland Kaufmann with the language region set to English (United States). Cmd-Shift-Z still does not work as of the latest update on Version 1.4.5 (installer 1.4.5), but I have found an alternative solution. Cmd-Shift-U happens to let you redo on both the Dvorak layout and standard QWERTY layout (on Mac Ventura 13.5.2 at least).
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