Roggi Knot-Beard was killed by a dragon, and at first I didn't think anything of it. Then I learned he had a quest and could become a companion.

I went back and rezzed him using the console command, and now there's only one conversation choice about what he likes to drink.

Any way to force an NPCs original dialog choices to be offered?

Thanks.

I don't know of any. Perhaps drinking with him and beating him in a drinking contest.

Getting killed by a dragon and then resurrected by the dragonborn can lead to alcoholism. I too would fixate on drinking after that.