Someone noticed the 10 right away. Thankfully, my players keep a sharp watch at showdown, in the aggregate anyway. I would count DQing a fouled Scarney hand right alongside identifying the winner as a group responsibility, once the hands are tabled.
Not sure I'd quite call bluffing with a fouled hand "angling," any more than bluffing on the end with a hand that doesn't play (e.g., 22 on a KKQQ3 board) would be angling. But I can appreciate that perspective. It's certainly unorthodox.
It's like opening with less than a pair of jacks in Jacks or Better. I have a friend who likes to call that sometimes, and I've asked him more than once if it's a valid play to bluff with a non-qualifying hand. Like suppose someone opens with nothing and makes a pair of jacks on the draw, or bluffs both rounds and takes it down uncontested. How should the table handle that if it were found out? He never has a real answer for me, aside from "You're not supposed to do that."
As much as I love playing Scarney-family games, stuff like this gives me pause. It's messy and it can make people upset.