If it were possible, I could perhaps rent a server. I don't want someone else to do this because I don't want to give away the wallet files. I think you can understand that.
It's not possible to brute force the given combination even the entropy reduced due to the availability of 20 characters and the remaining were only uppercase letters.
To find the entropy:
(A-Z) + ( 0-9) = 26 + 10 = 36
Unknown characters = 20
So number of possibilities= 36
20.
Even with the most powerful GPU brute forcing this combination will be forever.
Try to look for the remaining backup cause that's the only realistic option to recover your Bitcoin.