Find a way to plug a USB keyboard into the Apple II

Some things I've found:

- [USB serial to Apple II keyboard using Arduino](https://www.applefritter.com/content/usb-serial-apple-ii-ascii-keyboard-connector)
- [Mike Willegal's ASCII to PS/2 Keyboard Adapter](https://www.willegal.net/appleii/appleii-kb-int.htm)
- [Apple II USB Keyboard Adapter (A2USBKey)](https://www.a2heaven.com/webshop/index.php?rt=product/product&product_id=183) (sadly, out of stock)

One other option includes an [entire Apple II Replica keyboard](https://www.reactivemicro.com/product/unified-retro-keyboard-for-apple-ii-and-replica-1/) (expensive, and out of stock), and if we have cable issues, ReActiveMicro also has a [replacement Apple II keyboard ribbon cable](https://www.reactivemicro.com/product/ii-and-ii-plus-keyboard-cable/).

Start by reviewing the linked USB serial, PS/2 adapter, A2USBKey, replica keyboard, and cable references. Determine whether a practical USB-to-Apple II keyboard approach can be selected or documented; the issue names no repository file, entry point, or test, so the required implementation and completion criteria need clarification.

Written by the indexing model from the issue text.