SSH Remote Access - Testing

Hi guys, how do you revert settings for SSHD on remote VMs? in order not to be locked out if something goes wrong.

- sshd -T >> will check if config is ok or not, before exiting the VM.

Is there a way to revert the original settings after a certain time? just as a back up, if really some unforeseen circumstances that will pop-up and not able to SSH

Thanks.