Good news! I wonder if this means ALL Android Wear will work. Hopefully someone makes a list. I kinda miss my Android Wear when I moved to iOS and I didn't want an Apple Watch.
The trick is to make sure you get the latest Android Wear. That'll require an Android device. Not all iPhone owners will also own an Android device.
Edit: You'll need someone's phone for a few hours - the updates don't come all at once. But it's a matter of installing the Wear app on an Android device, pairing, installing updates. Then wipe the watch and pair with iPhone
It's not bad; I inadvertently did this trying to use the hacks to get my Moto 360 to work on my iPhone several months ago (which kinda worked but was really shitty). I just installed Android Wear on my old Android phone, paid it, it offered the update pretty quickly (though I can't remember if there is a way to force this or if it's only automatic), installed it and then I reset it.
Edit: You'll need someone's phone for a few hours - the updates don't come all at once. But it's a matter of installing the Wear app on an Android device, pairing, installing updates. Then wipe the watch and pair with iPhone