I'm studying for my license too, and I plan to run a 2m in My XJ. I've been periodically checking on eBay, where you can occasionally find police radio mounts removed from wrecked or stripped police cars. They come in a ton of different configurations. I sort of like the ones that mount under, and then come out from under, the side of the center console (so no visible holes are drilled in the floor or the console), then have an upright with the bracket mounted at the top. Some have adjustable height and angle, too. I thought of getting one of these and adapting a slide or quick-detach mount to it, so I can use it. I also thought of modifying one of these where it comes out from under the console (or just building my own base part) to be detachable, so that when not running the radio, the bracket is not in there either, except a small part of the base sticking out from under the side of the center console. My plan is to use one of those police brackets off eBay with my own mods, maybe using parts from camera or GPS mounts for a motorcycle, or possibly a modified part of a Panavise mount.
Just some ideas I've been kicking around.