Just wanted to revisit this and let you know there is now two more ways to connect Hubitat to Insteon devices. If you have a lot of Insteon sensors and devices like keypads, then you may wish to stick with a hybrid of homebridge/HomeKit/Virtual Switch and this driver that @cwwilson08 created out of a modified HTTP Momentary switch driver the @ogiewon wrote. It uses the Express Server which is part of Insteonlocal.
If you just want to control Insteon dimmers, switches and relays, then this latest driver that @cwwilson08 ported from ST. It controls directly via the Insteon PLM so hubs are supported too. Word of warning though, the Insteonlocal plugin and the direct PLM driver cannot be active at the same time, or you'll get an error when the direct driver tries to refresh status and you will not get the status update.