Personally i wouldnt destroy the bag...
Once youve removed what you want, leave a couple in there...seal the bag being half full of air, & maybe with a little water int, along a couple of smako's...then leave it out in the sun for a couple of hours...
Take an off-cut of house mesh with you, cut in the shape of a "T", as they use to pin down the membrane prior to pouring house slabs, & use one of them to pierce & pin the bag to the ground...
The odour will slowly release, acting like a burly if you will...
As for the smako's, id be more incined to drag them around the area on a rope/string...they are only foxes, & this time of year they are not as worried about your smell as say leading into gestation time...but having said that, marksman is right...still be dilligent & not wipe your feramones all over them...
Throw the odd bit out as you say for a teaser...
The only thing is, you mention the pigs smelt you last time...so you might need a shang-eye to launch the smako's out there...
The man who knows everything, doesnt really know everything...he's just stopped learning...