I managed to install Big Sur 11.2.2 on my SF-314-52. OpenCore 0.6.6, everything works: keyboard with caps lock led, function keys and brightness keys remapped; touchpad with custom gpi0 ssdt, wifi, bluetooth, igpu with fixed color banding, audio, usb, webcam, sleep/wake.
Card reader and fingerprint reader are not working as they weren't in Catalina.
I just swapped the Intel ssd with a Samsung 970 EVO Plus 500 GB.
If I have time I will write a guide but, if someone wants to try, just follow the dortania guide and fill the PlatformInfo section