So... things are progressing in that the yarns have been tested, in form of two tiny pieces of fabric, and we're now waiting to see how things look once the test bits are dry again. (Because, as we all know, no textile is ever finished before it's been washed and dried.)
Meanwhile, as opposed to some times in my past, I was smart enough to keep some of the test spun yarns for myself, for future reference, and that is how the storage for them looks:
Neither of the fibres is, unfortunately, a really good match for the fibres used in the original textile. We're close enough, though, for practical purposes.