No, I have not found examples of this done before. For the reduction I will be using Lithium diisobutyl-tert-butoxyaluminum hydride (LDBBA), which was actually mentioned on this forum in a topic on ester reduction. It's a very mild reducing reagent, but highly reactive toward Weinreb amides. Not sure how much more Weinreb amides are susceptible to nucleophilic additions then regular amides. Based on electronics I expect them to be more reactive, but I wasn't able to find literature to corroborate that.