That's the thing: a staked address is meant to prove you're the long-term account owner. Your account is over 10 years old, your staked address was only a few years old. Staking a new one is exactly what an account buyer/hacker would do, it means you can no longer prove you're the long-term owner.

You're going to be disappointed: there is no "standard" for signing Segwit addresses. Bitcoin Core can't even do it.