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There's a thread somewhere on TGO where someone replaced all of the lights in the switches with LEDs. The hardest part seems like it would be popping-off the switch "caps" without breaking them. Here are some pictures of an old one I use for testing.
This one shows one of the caps off, and you can see the light down inside of it.
In these next two, you can see the tabs that the cap pops onto/over.
And in the last pic, which you can see on the back of your switch, is how the two wires from each bulb are soldered onto the terminals.
I've never done it, but it looks simple enough. But if all of the lights in all of the switches have gone out, which is how the title of your thread reads, then I'd suspect the dash lights fuse, because it's not likely that they'd have all given up at the same time. So I'm guessing it's not actually all of them?