Double mash/Triple mash - sparge runnings

[thehaze]

I'm brewing a Double Mash Weizenbock with vanilla and bergamot orange and a Triple Mash Imperial Pastry Stout. I will not sparge these beers, so I thought if I sparge all the grains from each beer, will the runnings be enough to brew a small Wheat Pale Ale and a Dark Lager/Tiny Baltic Porter? I've read that the runnings themselves, could turn weird tasting, and most likely extremely thin and lacking in the malt department. But doing a double, and respectively a triple mash, wouldn't that mean the resulting gyle beers, could turn OK?

Any thoughts on this? I am sure not many have brewed using double/triple mashes.

Thank you.