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Well I was able to buy a coloured globe off ebay for the car. So I just assumed that I must be able to change them!!!Check out the link to the VF workshop manual at https://forums.justcommodores.com.au/threads/workshop-manual.269573/#post-2948673
I’d expect it should have the details you’d need, well at least it should specify how to remove the button or if indeed there is a changeable globe. In any case it’s worth downloading and keeping as a reference.
PS: i scanned through the workshop manual and didn't find much other than how to remove "18. Instrument panel Molding Replacement" which contains the Ignition Mode Switch and the "Figure 2 S38 Ingition Mode Switch" schematics. The later indicate the lighting of the button is provided by LEDs (which may or may not be replacable). Within "47 Interior Backlighting Malfunction" seems there should be diagnostic codes indicating backlighting problem. But the workshop manual is a real jumble, especially in this pdf form which does not have the links working as they should.
Oddly the owners manual has no info on lamp wattage which is odd.
Soon, we'll have to go to the dealer just to fill up with fuel