Hi all,
I would like to let you know that I successfully added to nexmon (framework to patch broadcom WiFi's driver+fw and add functionalities, like monitor mode) support for Orange Pi Zero 2+ (H3 and H5) running the latest Armbian (kernel next)
Both boards have AP6212A as WiFi chipset, that is based on same Broadcom core of Raspberry Pi 3B/0W (bcm43430a1).
What I did is basically porting brcmfmac's patches to 4.19 and compiling the Arm toolchain (for firmware cross-compiling) for aarch64. It ain't much but it's honest work
I kept airodump running for a few hours and it seems stable.
If you want to take a look/try it you can find the code here
I suggest you to buy one of the mentioned 8812AU USB dongles or, if you want to use the embedded WiFi, a Zero Plus2 H3 w/ Nexmon.
RTL8189FTV should support monitor mode (it's mostly a matter of drivers), but I never tested it so I can't guarantee.
Oh, since I haven't found one I made a little tool to dump the bootrom from userspace (tested on Armbian for H2+/H3, but should work on other SoCs too). I leave it here, just in case someone wants to play with this stuff