This is a linkpost for http://www.bbc.com/future/story/20170817-nasas-ambitious-plan-to-save-earth-from-a-supervolcano
Here is a variant idea (not sure if feasible): Set up a organization with the mission statement of building this geothermal plant by 2150 CE. It can start very low-staff, invest some money, and invest in relevant research. Then, after spending 100 or so years investigating the risks, it can start digging.
Motivation: We can spare 100 years when it comes to geology. We could approach this with next century's science and technology.
This is assuming the danger from unknown unknowns is large. Speaking as a non-expert, i would guess that it is.