find missing characters from my private key

[burnt]

I erased about half of the private key to my ethereum wallet. I still have the entire public address that it needs to match. It was generated with myetherwallet and i no longer have the keystore.json file unfortunately. I have an AWS account and am wondering if GPU cracking from an instance there would be enough to find the missing 32 characters. If so, how would one go about using hashcat to find the missing characters? I see a lot of posts about recovering the password to the json file, but nothing about private key/wallet address use cases. Any help would be appreciated