Cabal Magic question

[Lameth]

In the Cabal book, along with various other resources for ritual magic, it gives examples of items and components that can be used to increase your magic. My question is how many things can you combine into one single item? As an example, if you can use Steel, Diamonds, Blue, and effigies of owls, can you simply make a steel owl, with blue diamond eyes on only use that one item for now on to empower your magic ritual, and not need anything else, and still get all the bonuses?

I feel this is somehow cheating and removing the theme of ritual magic, right? Or am I being to hard? Or maybe an idea of only limiting two elements per item?

thank you