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I have tried to do Vallecito the past two summers and should have done it when I did ridge traverse to Wheeler. I wasn't looking forward to either going over Lake Fork again or bushwacking up the Rio Hondo. Cool page
It is quite feasible to day-hike Vallecito as a side trip while traversing Wheeler-Kachina ridge, but it adds 2-4 hours depending on snow conditions and the speed of your party. It could be done in summer season, but you will need a perfect weather. With snow, it would be ~11-13 hour car-to-car trip (traverse+Vallecito Mountain) if you using Wheeler West Slopes route.