Having been there myself, I would be surprised if that thing lasts much longer with just a new pump and shaft.
I would bet the main bearings are down to copper.
Mine was not knocking at all, I heard increase valve train noise at a stop light, saw the gauge, shut it down.
I state this negativeness to help you prepare for the worst.
I hope for you, I am proved wrong, but copper bearings was my treat after a lost oil pressure incident.
I have my fingers crossed for you.
I would bet the main bearings are down to copper.
Mine was not knocking at all, I heard increase valve train noise at a stop light, saw the gauge, shut it down.
I state this negativeness to help you prepare for the worst.
I hope for you, I am proved wrong, but copper bearings was my treat after a lost oil pressure incident.
I have my fingers crossed for you.