hi Mald0n I have the above laptop I managed to boot to Monterey with your prebuilt refi and few mods almost everything work except touchscreen.
Also I had to changed USB port kext for alps to built in instead od usb otherwise sleep doesn't work
Here is my send me files
https://www.mediafire.com/file/n7ygd9i06alw60s/Send+me+MacBook.zip/file
https://www.mediafire.com/file/n7ygd9i06alw60s/Send+me+MacBook.zip/file