I think Kevzara is worth a try after a year or two of Prednisone with relapsing PMR. I have never been on Kevzara but I have done weekly injections of Actemra. I currently do a monthly infusion of Actemra. Both Kevzara and Actemra are IL-6 receptor blockers so they work the same way.
https://www.nejm.org/doi/full/10.1056/NEJMoa2303452
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I was on Prednisone for more than 12 years until I was able to taper off Prednisone within a year after Actemra was tried. Twelve years of Prednisone was way too long!