morrownr told me the in-kernel driver for rtl8812bu is decent and speeds and stability roughly comparable to the out of kernel driver starting from kernel 6.2 or better the 6.3. The next release of OpenWrt 23.05 will use the 5.15 kernel. The release after (next year) will be likely 6.1. So unless the rtw88 driver is not backported, it will take two years until this hits OpenWrt.
If you only need the driver for your client device and not as accesspoint, you could install a rolling release linux distribution operating system (for example Fedora), which are those that usually follow the newest kernel versions more closely. If you cannot or are unwilling to do this, you can try the non-conforming out of kernel drivers, which are based on the official open sourced version from Realtek and usually are maintained by random, but helpful volunteers on the net (e.g. by morrownr here), but they bring their own share of problems and maybe some features will not work either.
There is also the package kmod-rtw88 in OpenWrt. You could try that one too! Who knows, maybe the performance is actually good enough for your usecase. Edit: see how to here
Edit²: the kmod-rtw88 package does not support USB until kernel 6.2 or something so yeah...