If your kitten is willing to eat raw, you can feed tiny pieces of raw meat instead of that "meatshake" you're currently providing.
You'd have to feed the kitten often, however, like every 4-6 hours around the clock if you want to go raw. Kittens that small can't eat large amounts like an adult, so they'll need the frequent feedings.
I think the meats you have are great. Are you familiar with the PMR (prey model raw) diet instead of grinding meat? That may be easier for you, you'd just need to balance out the meats, organ and bone content to the 80/10/5/5 rule. (80% muscle meat, which includes hearts & gizzards), 5-10% bone, 5% organ meats like liver and 5% secreting organs such as pancreas, kidneys, brain, testes, thyroid). I'd probably add at least one other protein source, as cats on PMR diets do better on a wider assortment of meats so they don't get obsessed with one type of meat and get a much more nutritionally balanced diet that allows for healthier growth and a less finicky cat. Do realize that all cats need
bones or they'll be calcium deficient and may even develop rickets! You can certainly feed a kitten this young by smashing a chicken neck into very tiny bits with a hammer. Bone is a lot more nutritious than eggshells or bone meals, due to the bone marrow where they get much more than just calcium, too. As for meats, you'll want to know that taurine is an essential amino acid that is prevalent only in raw meats. Choosing muscle meats that works hardest will contain a lot of taurine. Examples include all hearts, and more often legs/thighs than say, chicken breast. Taurine is also water soluble, so any excess that a cat consumed will be exceted in their urine, so no worries about toxic doses.
Hope that helps some for you, you may want to consider doing further research on this topic, too. Raw feeding isn't that difficult, but can be quite intimidating for someone who isn't prepared.
Some related links on raw feeding:
Nature's Prey Model
Why Prey-Model and Not BARF?
How to Transition Your Cat to a Raw Diet - Feline Nutrition
Raw Diets and Cats, What About Bones? - Feline Nutrition
There are other sites, but if you need more info, feel free to PM me. Good luck!