Pre-render LOD headlessly?

I run an SMP for my friends, and I'm planning on using Distant Horizons to render the entire map and then send them all the pre-rendered LOD. What's the best way to do this?

I was hoping there was a headless option so I could render it on the server rather than in a singleplayer world on my laptop. If there's not a headless option, then what's the best way to pre-render a large (16k by 16k) map?
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