It's a standard tactic, Alex, and not a bad one at this time of year too.
Comp anglers do it all the time with blobs (or other lures) and crunchers/Diawls/buzzers etc. The lure fetches the fish in for a butchers, and if they're not in the mood for a blob (who can blame them

) then the chances are, they'll have a nip at the nymph. Experiment with swapping positions (point/dropper) for the nymph and the lure.
Christy is right, that nymphs aren't their best fished quickly, but I think he underestimates the power of a slow/medium retrieve for a lure. As Mr Collyer says, the two can work hand in hand, on the day.