So, in the end, it turns out that the rectangular frame directly around the two round reading light lenses (and the two tiny cat eyes) does, quite easily, come out, without having to remove the whole panel. I started just outside of either cat eye, and the plastic clip there easily opened; then did the other; then the whole rectangular frame comes out easily. The original halogen bulbs are W5W, like the ones in the cargo area light assemblies; these simply pull straight out. (Not that I figured that out right at first; it looked like they might rotate. So I rotated them. Which rotated their entire socket. Right out of its rotate-to-clip-into-place, well, place. Which meant that I had to finagle the half-a-gram-if-that plastic socket back into the right 3D orientation above the lightbulb hole, and use a small pliers to grab a little metal tab to allow me to pull it back down through the hole, and rotate it back into locked position 🙄). The same "Astur" bulbs that I used for the cargo area lights work fine in the centre overhead console, too (polarity: + side of both bulbs faces towards the left/driver's seat on my car). And, as with the KATUR bulbs that I put in the over-door lights for the rear passenger seats, these DO dim down like the original halogen bulbs did. I also cleaned a small, dead bug off of the inside of one of the two front reading light lenses.... 🦟