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I don't know about the Apple Watch but there's a handheld personal EKG called Kardia (https://kardia.com) that works well. You hold the ends of the device and place the bottom on your knee (on bare skin) and take an EKG. You can easily fit this thing in your pocket.

I think our cardiologist worked with them on developing the device and we use it to take EKGs and remotely send them to the clinic. I think it's sensitive enough they can use it to look for stuff like this, but I also think LongQT is tricky enough to detect it just may not always show up. Maybe you could do a series of EKGs over a period of time and send them all in or something.