btw is the private key for address 3 and bc1q is able to import to bitcoin core?
It's possible, you just need to use
importprivkey command on Bitcoin Core console. I've tried it with example from private key and i got correct address.
- Import private key (and rescan blockchain)
importprivkey L2qvghanHHov914THEzDMTpAyoRmxo7Rh85FLE9oKwYUrycWqudp
- Import private key, giving label to the address and skip scanning blockchain to find all transaction correlated to theaddress
importprivkey L37xBVcFGeAZ9Tii7igqXBWmfiBhiwwiKQmchNXPV2LNREXQDLCp "Main address" false