I would have him rent from renport. Only other option would be to get your own simcard and your own router. That is an option that would be less expensive. I'd probably go with digicell as I've not had good luck with LIME lately and had better luck the one time we were given a router to use that was digicell.

Wifi is available in many spots, but not as reliable in the anchorage so it might require a trip to shore.

If he just needs email access, then getting an unlocked phone and sim card would be an option as well.