See? It is valid, and instead of 1MejoVXRvsmwyDpTpkw3VJ82NsjjT8SyEw mainnet address, you have n2Ah6YcQjuDCkLJ5YKuRKDLMEsLSPhKwWQ regtest address. And because a lot of altcoins just copy-pasted Bitcoin code, you can migrate their coinbase transactions as well.
Fascinating... I'm surprised that there's away around storing the entire blockchain history. Thanks for the post.