Thanks for the report.

So we can understand further, can you confirm where and what you have renamed, just so we can check why this is not showing up as expected?

Thanks for the detail, and if there is anything else you find let us know.

If all you are doing is overriding the libraries, you should not need a new core at all.

You can clone the libraries from the core, into your Sketchbook\Libraries folder, and make the amendments there.  These will take priority over the same libraries in the core due to the "Location Priority" of the Deep Search process (Arduino CLI Spec).  Both ArduinoIDE and Visual Micro should follow these rules in the same way.

This also has the added benefit of your changes not being lost when updating the board package.

Currently to get this to show up in Visual Micro a dummy package index file needs to be present and listed in the IDE Locations screen:

1) Clone Arduino15\package_esp32_index.json to package_esp32_halvoe_index.json
2) Alter the Top level "name" in the index to esp32_halvoe and save.
3) Add the dummy url http://localhost:1234/package_esp32_halvoe_index.json to the IDE locations screen
4) Click rescan or restart Visual Micro.

We will review this area of functionality and update when there are any changes to this.