So I was looking at this charger for $80 on B&H, looks nicer than the standard charger from Canon, right? LCD screen, battery meters, etc.

Pearstone Duo Battery Charger for Canon LP-E6 DLCCNLPE6 B&H

But then noticed that it looks like you can get the same charger for $30, then swap out the battery adapter plates for $5 x2, and it looks to me you have the same thing for 50% the cost.

Pearstone Duo Battery Charger for Samsung BP-70A DLCSGBP70A B&H

Pearstone Battery Adpater Plate for LP-E6 PLCNLPE6 B&H Photo

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Am I dreaming, or would this work?

hhmmm.. you may be right. The power output is the same.