You can use Siri with scenes, as far as I know. I say very night “good night Siri” and something magical happens. But that’s not what I meant.
You can group switches as one. Long press a switch, click on de clog wheel (right below) and click on group accessories.
An other tip, apart from the group question, you can use HomeKit bridge: HomeKit holy grail: homebridge-openhab2-complete
I like the fact that my openHAB items won’t need any metadata or tags. You configure a more powerful json file and you’re done.
I must say, I’ve used it because of the minimal support op OH 2.4. I haven’t compare it with the new functions of OH 2.5.