I found out how to change resolution on id7 exes so did just that and uploaded them here. Tested with 21:9 monitor and working flawlessly. If you would like a custom resolution PM me on discord (derole123#2960) and I might add it to the list of resolutions. Only done 3 for now (1920x1080, 2560x1080 and 5760x1080) but might do more.
Hope you enjoy :D