I would send a sample batch to WSSI for a test run. Do three pieces in undyed, three in light brown, three in red, and three in teal. When they come back you will be able to see how this batch of handle material will color. Be aware that every batch of wood (from the same slab of wood) will color differently. I think you will be amazed at how good the quilted comes out with no dye at all. It usually develops golds,browns, and tan highlights.
You can ship the whole big batch to Mike, and have the test batch enclosed in a smaller box , in order to avoid two shippings. Have him do the test and send you the test batch while holding the main batch.Sand and polish the test material to see the real colors (this is important !!), it often looks far different on the outside of the block.
Of course, this test run is only practical if you are having a large batch done. If you only have a couple of blocks, just go with undyed .
Stacy