Yes that would work except the retina display is a much better work monitor - the colour depth and accuracy is better - both are calibrated with Colour Munki and the Retina iMac has a much greater colour gamut. The 2nd display is used for menus, palettes etc. Obviously Apple need to bring out a Retina Thunderbolt screen but that may be awhile - they use the fact that the 5K is built in to get over bandwidth issues of the thunderbolt connector.
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