Oh, yeah, well that's a different story. 5oz of dextrose + 1.75oz brown sugar = almost 5 volumes CO2, and that's bottle bomb territory. That's just according to the math I get using the calculator I linked before (3.2 vol's from the dextrose and then another 1.7 from the brown sugar). Your plan should work in theory, just be careful and maybe put all of the bottles in a box or plastic tub or something to contain them in case something does go wrong. I've never had a bomb before, I don't know how violent they can be, but I'd hate for it to happen while you're handling them either. Keep us informed.