With some mod of your code, I could try another project, a vanity pubkey instead of an address pubkey:

https://crypto.stackexchange.com/questions/60239/elliptic-curve-and-vanity-public-keys


The "best" pubkey I have found with my onw cpu code so far is:


Without sha256 + ripemd160 + base58 encode, I guess I could achieve a very impressive key rate.