Copper Canyon Via Paved roads

Hi all,
Myself and 2 friends are planning a tri from Alberta Canada down to the state of Oaxaca in early Spring. We would like to swing east and ride the Copper Canyon.
We are on road bikes this trip so off road is something we want to avoid but at the same time be able to see the best of the Canyon via the paved and established routes.
Any Suggestions as far as best scenic routing  would be most appreciated.

Thanks in advance.

Gary Campbell

Carl adds:  please go to the forum “Northern Mexico & The Copper Canyon” for my detailed reply.

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