If the OP chose to do this, they should fully commit to it as if there is no other way if they want to succeed.
But, if the OP thinks they are crazy (and they definitely have doubts if they posted this here), they should indeed immediately take responsibility to hire a replacement and start interviewing elsewhere, hopefully in such a way that it will limit CV damage.
I conditionally disagree.
If the OP chose to do this, they should fully commit to it as if there is no other way if they want to succeed.
But, if the OP thinks they are crazy (and they definitely have doubts if they posted this here), they should indeed immediately take responsibility to hire a replacement and start interviewing elsewhere, hopefully in such a way that it will limit CV damage.