Cool, HID to VPAD for the Switch. I was wondering how long it takes until it appears.
Although it's not exactly like HID to VPAD.
HID to VPAD enabled two things: HID (not Xinput) controllers to be plugged in via USB. The controllers need a specific ini file telling the homebrew which hardware button is mapped to which input button. These configs were included for most popular controllers but for rare ones (like some random SNES pads from ebay) you had to do it yourself which was really easy as well. It also enabled the Switch Pro Controller (wired only obviously) to be used on the Wii U.
The second thing it enabled is using any controller that is supported by the homebrew as a replacement for the Wii U GamePad. That's right: This way the Wii U Pro Controller can be used to play "GamePad only games".
The reason I'm writing this is, because this might be interesting when we want to use the Switch Pro Controller to be registered as Joy-Cons so we can (theoretically) use it to play Pokémon Let's Go or Super Mario Party.
The closest it comes to is the HID to VPAD network client. This one enables all controllers, that are working on a PC, to be redirected to the Wii U with a small tool running on the PC the whole time.