This random point might be a fun and relatively easy spot to reach, since it lies in a very popular hiking and climbing area of the Pyrenees, on the France/Spain border not far from Ordessa National Park's Monte Perdido. Depending on how craggy the ridge is at this point, just set your GPS to WGS84, hike the crest, and stop when the longitude reads zero. You will then be the highest person on the Prime Meridian.
It should be noted that the Prime Meridian gets very high in altitude near the South Pole in Antarctica, and topographic mapping of the icecap is not exactly super accurate. However, it does seem pretty clear that it does not get over about 2800m, lower than this Pyrenees point.