It is okay if you just want to order switches. We are still waiting for a quote from our Germany source. There is another source in China that we could use. At this time it is unclear if we can secure all the switches we need for this project. So it may be a while before we will order switches. If you are just replacing blues with reds, you don't need diodes. But you will need to desolder all your blue switches and replace them with red switches, or replace just the stem and springs from red switches. Since you already have blues, which has the lighter spring like red and brown, and black stems is the same as red stems except the color, you could also get black switches to get black stems and replace your blue switches' blue stems with black stems. That will get you ghetto red.
edit: typos
