I so understand wanting the lighter quilt. It presents its own unique challenges. It is doable though. I have done such quilts by hand. It takes a bit of time and I use a large hoop and depending on the quilt will use stencils or just SITD over the whole quilt. The quits, as to be expected will be thin.
However I think you might regret making a king size quilt without the thinnest of bats as a minimal It doesn't need to be a real "warm" quilt but you should have a bit more stability and the bat will provide that. How do I know this??
. It does make it easier to quilt.