Well Homebridge and HomeKit are Apple-based so that pretty much limits all integration to that platform.
I realize that you're also using smart home products for an office, which isn't unheard of, but I would say that your requirements are beyond the scope of the Homebridge plugin for HomeKit at this time.
What would work best is if you simply integrated your Alarm Panel with the Konnected Cloud and used the SmartThings app on iOS or Android to control the alarm system.