All of the ADB to USB adapters I know of only support mice and keyboards and have internal firmware that maps to USB HID. You'd have to write a custom firmware to make a raw pass through to an emulator...
It would probably be easier to crack the software!
The Griffin iMate was the most popular ADB-USB adapter from the time, and probably supports non-input devices (it would’ve been the only option at the time to make those dongles work).
I have a large collection of vintage Mac's and peripherals, with the largest quantity being the Apple Keyboard II [1]. Archive forums all suggest the Belkin ADB Adapter [2] but that has long since been retired. I would like to make my own, i know instructions exist for a raw passthrough.
[1]https://en.wikipedia.org/wiki/File:Apple_Keyboard_II.jpg
[2]https://www.cnet.com/tech/computing/hack-your-old-macs-adb-k...