Unless you are going to do a partial- or all-grain recipe, you can't really use flaked corn. Dunno if you've been getting into grain brewing yet, I'm guessing no since you say you are on your 4th batch, but some people start into it that soon. (I'm just brewed my 6th, and the main thing holding me back from AG brewing is the time commitment... with two sons under three years old, it's hard to even find the ~3 hours necessary for setup, brew, and cleanup on an all-extract recipe!) (Edit: Unless you do the amylase thing I guess... for some reason I had this vague impression that doing that was either a big pain in the butt, or else undesirable for some other reason, but now I'm wracking my brain and I can't for the life of me figure out why I thought that. I guess I must just have imagined it/mixed it up with something else in the course of the last couple months of information overload

)
I would think rice extract syrup would get you the light body you are going for. TBH you're never going to brew anything quite like a BMC beer using extract -- it actually turns out the big breweries go to great lengths to make their crap beer!

Getting something to ferment to ~5% ABV and still have absolutely no flavor to speak of is no mean feat.
I don't blame yah one bit for brewing a beer to please the wife. I'm lucky, in that all that means for me is brewing, say, a Belgian Wit or a saison style when I'd rather be brewing a super-hoppy IPA. Can't complain about that!
I've got a summer lemon wheat beer fermenting right now that I am hoping will be an accessible and very thirst quenching session beer. If it turns out any good, I'll share the recipe.