OK I got a key but I figured out how to get infinite lava with bees so nyeh. If you breed a Cultivated Drone with a Modest Princess while in the nether you have a chance of getting a Sinister Bee which can live and breed in hot overworld climates. Sinister bees yield Simmering Combs with can be run through a centrifuge to get refractory wax and phosphor. And for some weird reason you can put cobble, dirt or sand into a squeezer with the phosphor to yield lava.
Running that process with just two beehives filled a tank with lava and the squeezer almost full of phosphor in less than 7 hours. Hook a geothermal generator to that shit and bam! infinite power. Just don't approach the Sinister beehives while they are active, they can attack even through your quantum suit and apparently even through apiarist armor.