Hey Bro, you know I always have useful information. I had a similar issue a few years ago. The one thing I found that could get my heart rate up the same as running was the rowing machine.
Secondly, I have suffered from Plantar Fasciitis as well and have been running with Hoka One One running shoes which have helped due to the massive amount of cushioning they have:
https://hokaoneone.co.nz/