Hi, I've read a lot in this forum about those creatures, in the past I've already created one putting a part of me inside it. I'm givving energy to a stone. Before I'm going to create a familiar magically linked to this stone, from which it will receive the magic, it could work?
I'm not entirely sure that you can create a familiar spirit, or am I thinking more of drawing a spirit into a vessel or contacting one?
There are also things called thoughtforms and golems which take a part of yourself in order to create.
I think it will work :) It actually sounds like a good plan! Just remember to release the familiar when you're done, or destroy it. Sometimes these things get a mind of their own and not in a good way.