Note that different color LEDs require different voltages, and if you just swap LEDs without properly re-engineering you will likely ruin something. This should not be a problem if you are just reusing the same old LEDs with the new switches.
Also, I'm not a "wiz", so I don't want to give a definitive answer, but you might want to look into solder composition and pick the most appropriate one for you needs. A lot of solder sold at retail now is "lead free", which IMHO is not as good as the old stuff for applications, like keyboards, that get banged around and could benefit from the flex-tolerance of lead based solders. Of course, you should never use lead based solders around children; lead causes brain damage in developing brains much more than it does in adults--but still, be careful!