Bobs/angels early game sulfur

I've been working through my first Bob's and Angel's run and am working my way towards blue science. This requires sulfur and I'm at a loss as to how to get it. I'm using FNEI, which shows a lot of recipes that require blue science to unlock, like coal cracking that can lead to hydrogen sulfide gas which goes to sulfur, but obviously I can't access these without sulfur to create the blue science packs.

The only recipe that seems to have a chance is the one that uses a green catalyst, can't remember the name, but it creates hydrogen sulfide gas from acid gas, which comes from natural gas. However, this needs aluminium and silver which require continium (sp?) and higher-level sorting recipes.

Is there a better way that I've just totally missed or do I just need to go down the catalyst path?