This feature isn’t exclusive to the Leonoardo, as [Michael] explains in a build he sent in – the lowly Arduino Uno can also serve as a USB HID keyboard with just a firmware update.

The board itself also has some differences from the original Arduino Uno. First of all, it has a USB type-C port, which is definitely a bonus. Secondly, it’s simpler: No USB-UART (which also ...

and its USB port is somewhat outdated (who still has a USB-B cable nowadays?). But even after eliminating the Uno from your selection, you'll still be left with a wide array of Arduino boards to ...