I would do it wearing Shin armore beyond shin guards but I would wrap my shins/ankles/feet with a matrix of high and medium density foam with aramid and several layers of dense cardboard or even phonebook paper topped off with sharkskin or mantaray skin.
you're overthinking it. lots of people here knife hunt hogs. the dogs hold the hog by the ears distracting it and the person rushes in and stabs it thru the side behind shoulder plate. they don't flip em over. search YouTube for hog knife hunts. many are kinda brutal to post here. there's one that shows a little girl doing it. if she can you can