I would definitely skip the crop oil and the dawn will do no harm. I use it when I spray gly around the house. I add it last to minimize foam.
Having said that, in you case D, I'm not sure I'd use cleth. It works best on young grasses. That would be the case if you planted a clover field in the spring. Not the best practice in my book, but if one planted clover in the spring, any grasses would be young and the cleth without crop oil would work. The older grasses are the less effective cleth becomes. Crop oil can help with that by stressing the grass as well. Dawn helps break down a protective layer some plants can produce. If you have every tried to use gly on something with glossy leaves you will find the plant has natural oils that kind of protect the plant. Dawn can break these down allowing the herbicide to work better.
Back to your case. The Winter Rye is your friend for establishing clover. The warm season grasses are not. If you kill the grasses you will kill the WR. In your case, I would simply keep the field mowed and see what you get. The mower won't control the grass but it also won't kill the WR. If you kill the WR, you will make more room for summer grasses and other weeds. After the winter rye dies naturally, and clover will be a bit older. At that point, you could let the field grow out. A wicking bar with gly could be used to select for clover by height as one approach. Another approach is to wait for next spring and use 1 qt/ac gly after green up and then overseed with clover.
Just some thoughts to consider.
Thanks,
jack