Mow it low, don't worry about where the seeds go - they will germ but the growth will diminish. After mowing dethatch then overseed with bermuda - wet, let dry, wet, etc. til it germs out
Winter rye is typically an annual mix that will germ in cooler temps. The seeds will continue to germ in the summer but the amount of live grass will taper off as the seeds are reduced each time. If you mow winter rye before it goes to seed it will practically never come back. It makes a great "bed" to support perennial grasses. As it dies off it can reduce nitrogen levels in soil which makes it harder for some weeds/small plants to grow. It can also "fix" dead spots in lawns as it dies off - that is why it is in lawn patch
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