Low tech low dollar answer.
Remove the pump and disassemble. Most of the time the bearings are just fine it is the vanes making the noise. The pump vanes are phenolic so just finish them off by breaking them. Once the vanes are gone you can run the pump as an idler pulley. It looks like before but it will never seize up.
I did this to seized pump 6 years ago. I am still running this pump on my car today.
Mike
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