FYI - in case you didn't know about @srwhite's HubConnect. It lets you seamlessly connect and share devices between Hubitat hubs or Hubitat and SmartThings hubs. You could leave those sensors on ST, and have them control Hubitat paired devices.
The current released version is 1.6.4. However, I think it is being EOLed at the end of this month and HubConnect version 2.0 is currently at release candidate 1.
HubConnect makes it easy to migrate to Hubitat while leaving "incompatible" devices on ST.
