I have an iDevices wired outlet and wall switch. You have three choices for control, but only one is local, and none are directly integrated.
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Use HomeKit (local). This will require you to setup a Homebridge server. You will have very good stability and reponse time using @dan.t 's Homebridge MakerAPI plugin for Hubitat. You then link it via HomeKit automations to a Hubitat virtual switch. This will give you a pseudo-local feedback to the switches state. There is no guarantee that it will not get out of sync, but with this version of the Homebridge plugin for Hubitat, I have had no problems at all.
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Install a custom Driver the simulates an active motion sensor when a switch is flipped. Then add that to an Alexa Routine to trigger the switch. This does not provide any feedback in HE. You’re basically hoping a switch turned on when it should have, and turned off when it should have.
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Use Google Assistant Relay to turn the switch on and off. This again requires that you set up a GS server to host Google Assistant Relay.
There is no need to own an Echo or Google Home for methods 2 & 3. Method 2 is the easiest and will cost you nothing extra, but method 1 will give you a true local method, with the only exception being that you must have either an iPad that is new enough to function as a HomeKit automation hub, or an AppleTV, or a HomePod. It is by far the most expensive method, but wonderful if you're already have what's needed. Having everything in HE available in HomeKit is very convenient, fast and reliable in my experience with the Homebridge MakerAPI plugin. I had trouble with previous iterations, but this one is rock solid for me.
