... As asked, the question is nonsensical, and my reply reflects that. What is "happy sunny glow"? The character of light from a cloudless sky is completely different from that of a cloudy day, because the size of the light source is much different. A point light source gives a very sharp shadow. You cannot replicate a point-source light with a large-source light. Therefore the answer is "NO!"
A slightly overcast day is actually better for portraiture, don't you know...
There is nothing non-sensical in the OP question. The guy is a wedding photographer, and his brides want "white sand" when it is actually yellowish, and they want "happy sunny glow" as well. And they should get it, because "the bride is always right."
You are making too many assumptions, like that the only light during daylight is the mid-day, point-source one, producing harsh shadows. The light toward the end of the day, around the "golden" hour" tends to produce that "happy sunny glow." Even during the mid-day, using a diffuser (to cast a shade) and a golden reflector might produce some of that "happy sunny glow."
Obviously, no one and nothing can reproduce
exactly the "happy sunny glow" effect with a heavy overcast. What we could do, other than saying that flippant "NO" is to help the guy to
mimic, do what he can, and come as close as humanly possible to what the client wants. Hence my advice.