I think it depends on how much you want to invest. You could pretty easily go tphjr route with minimal investment, or you could build a full on electric kettle. Which you could then add in the HERMS coil.
While neither of these are HERMS systems. I would think they would get you the electric kettle portion. You'd just need to add on the coil and such. They do both use PIDs though. If you're against using the PID for now, I would think just running the element plugged directly into the wall would produce good results for you.
If I remember right I think a few of the builds of this system use the electric stove to supplement the heating element
I referenced both a ton while building my rig. There are also quite a few EBIAB threads floating around that are great and different examples of electric kettles.