Hi Jared, yes, you can substitute an uphill hike for a run, and you can make the hike a bit longer if you want, e.g. 45-60 mins to replace a 30-min run. Just be sure to stay slow and easy — including on the downhill — and make sure you’re recovering well.
By the way, that’s a pretty high AeT, so you might want to mix in zone 1 with your zone 2.