fwiw, I got a couple of these sticks. Once I downgraded to 2.0.1 firmware the QMI device showed up just fine.
I'm in the EU so I used EU firmware. It took a few attempts to get it going.
It might be, that this is actually a A3 and not A2. I recently bought one of theese sticks DWM-222 3.0.1 EUR A3. Had to haxor in device 2001:ab01 into /etc/usb-mode.json to get it to swap mode.
After that, it will reckognise a new device 2001:7e46 which will be detected by RNDIS stuff.
I mostly followed this guide: https://gist.github.com/RoganDawes/afcc0aa1d12b53b540afc94ffc8e4494
Doing the echo stuff into /sys/bus using the 2001:7e46 does changes things abit and lsusb -v -d does give some interesting results mentioning cdc ether and a bunch of things which i havent been able to make work myself. Without the "echo stuff" and only the modeswitch, it does work with RNDIS here. Maybe someone else more talented than myself could possibly figure it out and somehow integrate it more properly into OpenWrt.