Hi Camron,
It's possible to control, but you won't get status in Hubitat without an intermediate listening to the messages that come from the Insteon hub (which are in Hex). There were drivers built that are still shared here, which simplify the sending of HTTP commands to the Insteon hub. But the problem is that when a switch is manually controlled, things are then out of sync from what the Hubitat hub knows about.
The node.js server is merely running the open source node package named Home Controller with some enhancements and a driver specifically for Hubitat to communicate with it. There was much work done on this some years ago, and this is what the SmartThings, Homebridge and OpenHab integrations were built upon. There's really no way around this bridging to still get status from Insteon now that their cloud server is gone. Every hub or service I can think of, such as Hubitat, ISY, SmartThings, Homebridge, OpenHab, Home Assistant, Homeboy, and Stringify, have used some kind of bridge, whether internal or external cloud API calls (now gone), in order to get device status from the Insteon hub or a PLM.
The most turnkey is Home Assistant, and while that can be connected to Hubitat with the community provided Home Assistant Device Bridge Integration, that isn't a great solution. The Home Assistant integration works, but it has real serious synchronization issues. I can manually toggle my Insteon dimmers on/off, and more than half the time it doesn't update its status.
One thought would be to build the node.js image once on a Raspberry Pi, and then just clone the microSD card and image it multiple times. There would be some manual configuration of the config.json file for each customer, but once it's setup, there's really no need to touch it. I can toggle my dimmers using the node.js server integration with Hubitat and watch the status instantly update over and over again without fail. It's just far superior to the state of the Home Assistant Insteon integration as of today. The only thing their solution has that the Hubitat node.js integration doesn't is the ability to control the device settings like Ramp rate and default dim level. That capability is now integrated in Home Assistant and will show up in the side bar when their Insteon integration is enabled as of HA version 2022.5.0
