Are there any cons of using a backlit keyboard? Haven't really found anything about it but I know that I read somewhere that it could make it harder to change the switch if you would want to or something similar. I'm close to pull the trigger on a KBT Pure with browns, with or without blue backlight. This will be my first mech (or my second if you count the Model M) btw.
Almost all backlit boards I've seen have been plate mounted, so swapping switches is a bit rough in and of itself, requiring desoldering of the switch to do so (unless you have installed a custom plate that makes it easier to swap the switches, and even then, you would have had to desolder at least once). LEDs generally have to be desoldered to be able to remove the switch, but you can modify the top of the housing to be able to remove the switch around the LED.
Also, just read more of your post. A Pure would require you to desolder all of the LEDs to swap the stems and springs out, or you would have to mod the housings. It's not that hard to do. Just a couple clips with something, or a Dremel, as someone else suggested.