nanoCH32V203 VS hid-remapper

If you are willing to try r/RISCV ones, then nanoCH32V203 (with two Full-Speed interfaces) and nanoCH32V305 (with one Full-Speed and one High-Speed interface) might be enough.

There are dual USB r/RISCV boards with GPIO pins exposed, like nanoCH32V203 and nanoCH32V305.

Another alternative is to use dual USB MCU board like nanoCH32V203 as USB CDC relay.

RISC-V boards cost $3-$6 depending if you want high speed USB or full speed one.

Their earlier boards like nanoCH32V203 and nanoCH32V305 were more user friendly, one could flash those via USB without WCH-Link.

Muse Lab has MCU boards like nanoCH32V203 and nanoCH32V305.

The same form factor as nanoCH32V203, but with more RAM and storage, also one of USB interfaces is high speed and SDIO is native this time. Comparable to CH32V307 boards, but lacks ethernet port.

Speaking of hardware there is very nice $3 RISC-V board that would fit well USB to USB converter use case. No keyboard firmware is ported to it yet.

You could use HID Remapper basically a USB dongle that sits between your device and computer. It's hardware based so no installation on company device, program it at home, plug n play. Supports macros too. Very cheap and easy to build.

Try to build this: https://github.com/jfedor2/hid-remapper

If you do not need WiFi or BLE, take a look at https://github.com/jfedor2/hid-remapper. Works on Adafruit Feather RP2040 with USB Type A Host board. Or use a raspberry pi pico board and wire in a USB Type A host connector. The USB host works by bit-bang assisted in hardware using the PIO.

Here's another solution that is OS independent. I configured mine so that if I hold right click, moving the ball scrolls. Right click works normally when clicked. https://github.com/jfedor2/hid-remapper

The best way I have found is to build an HID remapper and remap the buttons with its web interface. I know most would prefer a software solution but this is very intuitive and gives you so much control over the device.

I know this open source device exists, which among other things can do polling rate overclocking to ensure 1 kHz polling rate.

There's always HID Remapper!

Bill and myself did some e-mail exchanges this week starting about April 25. He is quick. He managed to get the hid-remapper (https://github.com/jfedor2/hid-remapper) from Jacek Fedoryński (jfedor2) working on this new RP2040 and we got our first taste of tremor filtering with the new device.

That would be Pico-PIO-USB library or some people combine two Pico boards (or one board with two RP2040 MCUs).

Check out hid-remapper. It allows remapping of all Slimblade buttons with a lot of flexibility.