The P100 is a simple Wifi device. Just reconnect them all to Home Assistant and then share them back to Hubitat using Home Assistant Device Bridge. Now Hubitat can control the device for automations via Rule Machine, and Home Assistant can still give you all the device history and trend information with it's nice built-in graphs and stuff. Best of both worlds.
[RELEASE] Home Assistant Device Bridge (HADB) - 
Custom Apps and Drivers / Custom Drivers - Hubitat
but also:
On a related note, the connectivity problem after a power outage is probably related to your router handing it a new IP address when the power resumes. You might be able to solve the problem by supplying the devices an IP address reservation in your router so that they receive the same IPs each time they reconnect.
