I'm not sure when you use the stance b/c you know that you hit the moment you resolve the attack roll but is the clause "...whenever you hit..." fullfilled right there or only after completing the hit entry?
"When you hit" is before you apply damage (according to CS on Blightbeast stuff for our Druid) so I assume before the Hit Line (as damage is the first effect of the Hit Line).
Thus you trigger the Stance, then Footwork Lure's Hit line takes effect.
It's not clear, so I think the steps after that are:
1. does one interpretation break the game. If yes, use the other one, if no go to 2.
2. Let the person using the power pick. (the principle that unclear things are resolved to benefit the PC)
An example against your reasoning is the following:
Fighter + Marked Scourge
The fighter attacks an unmarked target, according to combat challenge he can mark it on a hit or miss but there is the agreement (ruling) that marked scourge works not on the marking attack only on following attacks. Therefore, the hit is complete as soon as the hit entry has been resolved. If you use this logic on the above case it would lead to the following result:
Footwork Lure's hit entry followed by the stance's effect.