I never bothered to lube the stems, too much effort for me. If I would do it, I would go the lazy way and put them in a ziplock and spray in some ptfe and give them some shake.
I used to lube the stabilizer with a little lithium grease, but found that breaking them in is better in the end. Just pop the wire in and out of the clips a few dozen times, pull up on it firmly but gently to loosen the plastic clips a little bit.
To open the switch I use the 2 tiny flat screwdrivers. One to press the tab and the other I slide under the top on one side to prevent it from snap back while I do the 2nd side. It's pretty easy that way.
When it comes down to it the only thing that is work on swapping the stem is to unsolder the led if you are changing those. But if you are, a good time to put in a better led color if you are sure that is the end of swapping.