To my knowledge, all SAKs from both manufacturers are riveted together. As you go through the various forums that discuss SAKs you will find that a lot of modders do use some type of threaded connector for assembly. I agree, it would make things easier for modification. There have been links posted on where the various hardware for knife making/modifying can be purchased as well. I'm not on a device with all that bookmarked right now. Hopefully somebody will chime in with a bit more detailed info.
John