Recover lost bookies

[merajblueshift]

Hi All.
We have a pulsar cluster running all in same AZ. Today we lost 3 bookies together due to AWS issue. We did run decommission command for those bookies but some of the ledgers are completely lost and decommission is not able to proceed. Wanted to get some suggestion on what we need to do further. I did some reading and one guy who had faced the same issue deleted the lost ledgers manually using below command.
/opt/bookkeeper/bin/bookkeeper shell deleteledger
Can we safely run this command for lost ledgers?
And can we just boot up a replacement bookie with same hostname and run formatbookie to cleanup cookie from ZK and let the bookie replace the old lost bookie?
Any help on this will be highly appreciated.