I will eagerly anticipate your results. I remember once there was a discussion here about those old hand carded wool battings wrapped in cheese cloth. Some members remember their grandmothers only using them in tied quilts and the bats were never washed. The quilt top and backing were assembled like a duvet. When they needed cleaning, all the ties were cut, the batting removed and beaten and aired out and the tops were washed separately. Once everything was cleaned and aired out the batting was put back into the quilt "duvet", slip stitch closed and re-tied.
The ones who described the process said it was only done once per year. Not surprising when you consider the amount of work involved.