@Roner First thing you need is a keycap puller. There are people who say you can use a paper clip, or all kind of other stuff, and in fact I once used two pastry forks as levers. But that is no fun, and you can damage your keycaps. Get a keycap puller and play around with it. Next thing you want to have is a programmable controller, so that you can change your keyboard layout freely. The only controller available for your Filco is “Pegasus hoof”. Then, you want an application to program your Pegasus Hoof, download “Easy AVR USB Keyboard Firmware Keymapper”. Then you want to change your keycaps, order some keycaps of your taste. The o ring mod is a nice experience too, but I don’t recommend it, forget it.