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Earlier this year I completed a similar task going from a 2012 R2 hierarchy to a stand-alone Primary running CB 1607. I chose to do a side-by-side migration which resulted in zero downtime and I was able to take my time moving clients/apps/settings over. There was no impact with AD. Existing clients continued to report to the old environment until I moved them to the new one. This is one of the articles I used as a guide. https://www.systemcenterdudes.com/sccm-1511-migration/