I don't think it's worth making an issue of the last pen. Didn't the Liverpool fans try and claim Bravo came off his line on the penalty he saved in the charity shield? As well as claiming Jesus should have had to retake his, even though there was nothing wrong with his run up by the laws of the game. I laughed at them then, so I'm fine with the pens here. It was a poor penalty, that he was probably going to save anyway. If anything, Keper should have already kept atleast one of the pens that he got a hand to, out before that.
For pens in general, going forward under VAR. Player encroachment is one thing but I think keepers should be given some leeway as long as they don't take liberties. Not sure what the rules actually say to the letter but that seems the fairest way.