PREEMPT_RT is fully merged in mainline Linux as of 2024 (https://en.wikipedia.org/wiki/PREEMPT_RT).

Here is the updated image with Wifi and EMMC boot https://github.com/sicXnull/armbian-build/releases/download/mxqpro/Armbian-unofficial_26.02.0-trunk_Mxqpro-h313_trixie_current_6.12.74_cinnamon_desktop.img.xz

I just tried booting this LibreELEC test build on my nanopi R6S and to my amazement everything worked great in that build/kernel/bootloader. This means it is technically possible and the ingredients are out there, to bad it isn't on Armbian yet...

Armbian 25.11.2 Noble XFCE (BSP Kernel: 6.1.115) + PanVk - mesa 26.0 (https://launchpad.net/~ernstp/+archive/ubuntu/mesaaco) + Box64 arm64 v0.4.1 ed9827920 (https://ryanfortner.github.io/box64-debs/) + ge-proton10-29 (https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/GE-Proton10-29) (GE-proton is more likely to be segment fault-proof than other wine-proton versions) + dgVoodoo2 (https://github.com/dege-diosg/dgVoodoo2/releases) + DXVK-stripped v2.5.3 30~40fps@720p (low settings, texture high) box64 environment variables: RESIDENT EVIL 6

I don't know, perhaps the author knows. Try. If it doesn't work, then fe's wiki is misleading.