Originally Posted by mattie_p
Sure. As long as you have access to someone with the prerequisites ( ML 5th; Craft Psionic Arms and Armor, defensive precognition;) it can be added to any weapon of masterwork quality or better, to include magic weapons. The fixed price of +8000 means it does not increase the costs of additional +1 or higher enchantments as well.
Small nitpick, but it was updated in the MiC, and it was replaced as a +2 bonus. But other than that, yes, everything else you said was 100% correct.