Sure, why not. It will still be beer.
Corn sugar brings no flavor to the party. LGS might bring some subtle flavors of its own.
My guess is the it would be roughly like the substation ratio of DMW to LME which is, I if I recall now that DME ~44 ppg and LME is ~36 ppg. If your off a few gravity points it's really not a problem.
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Steve in St Cloud, MN
Mosiac Pale Malt SMaSH
Jolly Pumpkin Bam Biere clone - sort of
Tap 1 -6 Jolly Fellows Porter
Tap 2 - Cream of Three Crops Cream Ale
Tap 3 - Long Winters Nap Barley Wine - 2014
Tap 4 - Open
Bottles - Long Winters Nap Barley Wine - 2012 & 2013, Flanders Red, Amercian Wheat & some odds and ends
In the bullpen:
Semisweet Straight Mead