That accomplishes everything I'm looking for.
I've got another, related question for you. Is there a way to launch several panels into a new panel, docked together as tabs?
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One extension can provide a UI with multiple tabs.
Multiple extensions can be opened and docked into an Adobe app's Workspace. You could save a Workspace with all panels configured, to your liking.
There is no way to 'force' one independent extension, to open as a tab in another extension.