[@vancexentan] That's why I ran it past you first.

My justification is that the elements my character is aligned with are Fire and Earth, which deal with energy transfer and embedding respectively. The process itself is similar to reinforcement (a simple magecraft that even Shirou could handle), but instead of the mana strengthening the object, it instead embeds his origin into the object. Because it is his origin that allowed James to use his unique magecraft, I figured it wouldn't be too much of a stretch.