Yes, that is what I want to do. My own string in address. I don't need pvk nor pubkey.

Let's say I have "MyString" and I need to see it in address. Starting characters and ending can be any.
So, for example, I base58decode_check("MyStringChecksum"), I am getting bytes, add some at the end for proper length and checksum, and at the end base58encode_check the bytes giving me what I want.

I just don't know how to code that (mostly in Python 3).