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If the lower layers are denser despite their much higher temperature and also super viscous, how can volcanos ever form? What if we drill right through this area with an even later size hole? In this caw tho, note that all of the back-pressure is missing at the hole, so gases would violently went to escape (10'000s of bar vs. 1 bar), which should be plenty of driving force to get stuff above the ground. Due to the outgassing the density should also massively decrease. Kind of like lowering a pipe into a volcanic lake that has CO2 dissolved in the deeper layers and letting that vent in a fountain.
Note that the pressure would go down, not up, as it ascends. But the volume would go up because of the lower pressure.
Still would be quite difficult. We think about 90% of accessing magma never makes it to the surface simply because it loses overpressure. It mostly comes down to how vicious the mama is and what it's overall volatile content. All is which is dependent on the magma temperature, access to water, and silicate composition.