If this is possible would this produce the key to the genesis block? I am very curious why you'd see bitcoin spinoffs like BCH have different wallet formats than bitcoin.
Anyone can copy Bitcoin's source code and make a new cryptocurrency with a few simple tweaks. I don't know about the Genesis block since that's the first block generated when you give birth to a new blockchain network. As far as I'm aware, there's no key needed for that. Copying Bitcoin may be easy, but the tricky part would be getting your new coin to get the attention it deserves from people in the mainstream world. If you don't know much about programming or even cryptography, you'll be out of luck. A direct copy of Bitcoin would prove to be a failure in the long run. It's all about bringing innovation in order to attract as much people into your project as possible. Everything is decentralized and open source, so anyone can copy Bitcoin's code and make a new coin without any restrictions whatsoever. Just my opinion