The increased cardiovascular risk is approximately 2x greater for people with PMR. The cardiovascular risk from long term Prednisone is about 6x greater. The combination of chronic inflammation and Prednisone compounds the risk.

The following link concludes that the cardiovascular risk increases with higher doses and longer duration of corticosteroids but no dose is safe.
https://evidence.nihr.ac.uk/alert/low-doses-steroids-increase-cardiovascular-risks-in-inflammatory-diseases/
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If there was any consolation --- I stopped 3 blood pressure medications, a statin and warfarin over the course of the 5 years since Prednisone was stopped. I'm still being treated for PMR but not with Prednisone anymore.