Line an 8x8 inch baking pan with parchment paper or waxed paper, leaving an overhang for easy removal.
In a large saucepan over medium low heat, combine the peanut butter, butter, and sweetener. Stir until melted and smooth, then stir in the caramel extract.
Add the crushed pork rinds and flaked coconut and stir to coat well, then press this mixture firmly into the prepared baking pan. Chill until firm, about 1 hour.
In a heatproof bowl set over a pan of barely simmering water, melt the chocolate and coconut oil together. Spread over the chilled bars and let set in the fridge, about 20 minutes.
Lift the bars out by the parchment paper edges and cut into squares with a large, sharp knife. These are rich so cut into 20 to 25 squares.