I am drawn to the cycle of life and death as well! I think celebrating mortality and the oneness of living and dying by incorporating your cat's remains into your practice is a great way to move forward. If you still have your cat's remains, I would recommend getting in touch with a professional bone processor who has a colony of dermestid beetles. These beetles will consume the soft tissue so you can obtain relatively clean bones. Hopefully there is someone with this resource in your area.