is there any hope of continuing with an old world?

Background:
So, me and my friend have been playing on a private server just the two of us, and wth every update in the past we have been able to copy our world and move on, but with the new addition of sulfur we can't do that so simply because our world isn't loaded with sulfur.

The question:
Is there any way we can add sulfur into the ground? We're trying not to cheat, and we really don't want to restart as we just got the assembly line :/

We have tried the regen command in hopes that we could maybe regenerate the biome that the sulfur is supposed to spawn in. The problem is that we have no idea if it even worked