Heya,
I've just released 2.6.3 which will adds a method to convert lava, stone and steam into glass - this is unlocked with Foundry tech.
Typically the base method on Vulcanus is the use calcite + sulphuric acid to create steam to power generators.
F+ also has Geothemal steam on the planet, which could be used, but are typically just outside the starting area.
However, i'm not sure exactly how the flow will work with the specific mod to start on that planet. If there is still difficulty, let me know what the mod is so I can create an exception for it.
Cheers.