Alright! The workaround is now working. To summarize:
All I needed to do is put the custom edid.bin file (that i made on windows with
the custom resolution utility with the minimum VRR set to 48 instead of 24) in
/lib/firmware/edid
Then edid /etc/default/grub with the following line:
GRUB_CMDLINE_LINUX_DEFAULT="drm.edid_firmware=DP-2:edid/edid.bin quiet" 
(You need to change DP-2 to whatever you get with  "grep .
/sys/class/drm/card*-*/status" )
After that I did "sudo update-grub" and rebooted the machine.

It's working flawlessly :) The upside of this method is that it is permanent.

Thank You for Your time and effort to help me Nicholas! Your pointers were
priceless!

Also I don't know if it's feasible but it would be nice if this workaround
wouldn't be needed in the first place.