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There are so many links you could refer here ..Few are below

https://ask.openstack.org/en/question/43573/modify-keypair-in-instances-already-running/

https://ask.openstack.org/en/question/101681/add-keypair-to-running-vm/

https://ask.openstack.org/en/question/68140/best-way-to-incorporate-multiple-ssh-key-pairs-into-vms/

https://ask.openstack.org/en/question/61288/add-keypair-to-existing-instance/

If nothing works What you could do is take a snapshot, boot a new instance from that snapshot, and specify a key to get injected.

Best of luck !