When my house was built, I didn't know where the fence/gate would end up, so wire was installed to the general area. It was up to me to finish trenching and wiring up once the gate was installed. That's where I'm at now.

The goal is to have both switched and constant power at the gate. Since it's outdoors (in a weatherproof enclosure), I'm thinking I need GFCI. However, I don't think you can do GFCI on a split outlet, right?

If I use a GFCI breaker and wire as depicted in the diagram below, will that work? If it's not possible (allowed), what are my options?

Thanks for the help!