No offense, but I wouldn't bet on that.
Druggies are an entirely different class of being.
If they can find a way to mainline it with a shovel, that's what they'll do.
No offense, but I think I know a bit more about this than you do. While it is not theoretically impossible to extract the oxycodone from the patch (where it is chemically encased in phosphoylated tocopheryl vesicles), the difficulty and cost of doing so exceeds the difficulty and cost of synthesizing oxycodone directly.
Bring the druggies on, they will break their shovels on this one.