I do not know of any such dongle, but I'd like to ask you a question if you don't mind: are you looking for a dongle with open-source firmware, or would a dongle that has its (proprietary) firmware stored in some onboard memory be acceptable?
The second option wouldn't require you to install any proprietary firmware on your computer, but you'd still rely on the proprietary firmware for the device to run. And it might also exist, unlike a dongle with FOSS firmware.
To be fair, giving a company that's been failing to get themed icons to work on Android for almost four years now less than a month to make a significant change to a core part of their software is... quite weird?
Like, the EU usually gives companies at least half a year to comply with smaller demands than this, because companies with such a huge bureaucracy load wouldn't even be able to change an app logo in such a short amount of time.