The reports on reversals have taken place within 50k year of each other suggest this is cyclical events related to precession cycle that probably involves Galactic Center of Milky Way. Sun-Galactic Center is known to have an approximate 100k year sub-precession cycle, documented in periodic studies for ice age cycles, galactic precession has cycles in longer period.
In the "Outer solar system" chart of the Planet Finder, Galactic Center in the constellation of Sagittarius is located at the six o'clock position.
Do an experiment by holding a weakly magnetized paramagnetic ball bearing suspending at short distance within the magnetic field from a magnet fixed on a platform. Move in another strong magnet towards the ball bearing with the other magnet at the far side, move in the strong magnet with the same magnetic pole facing up, at a near range the magnetic pole of the ball bearing will flip. This experiment suggest the phenomenon of magnetic reversal could be a localized event. I believe you are very knowledgeable in magnetic field behaviour to understand the above experiment without much elaboration.
Unless the iron rich lava flows in different locations taking place over long periods of eruption where in the melt the iron was magnetized to the field are found all over Earth as a global event that had occurred simultaneously, it cannot confirm a complete magnetic reversal of Earth from the core had taken place.
Based on singular vortex mechanism, on a Sun-Jupiter-Saturn aligned solar system formation when sunspot activity is peaked, this formation account for the flip in magnetic polarity of sunspots. Sunspot is vortex of Sun's photosphere, is similar to vortex of molten matter on Earth that can be formed as a a result of torque-free precession on viscous mass cause by torque-induced precession from focused gravities of solar system alignment.
Sun-Jupiter-Saturn aligned solar system formation
Those magnetic field reversal found in the melts at different location could be localized events of aligned solar system objects in precession cycles spawning vortex of molten matter on Earth causing volcanic activities, this mechanism is similar to sunspots that has spawned all over subtropical region with flipped magnetic polarity. For lava flows carrying iron triggered by vortex of molten matter on Earth, it would have left traces of flipped magnetic field in those melts caused by these localized events at different geographical locations.
I am not totally ruling out a complete magnetic field reversal of Earth in historic events of distance past, merely suggesting that those evidence should be revisited from the perspective of UVS.