Don't get me wrong, I don't want to play first moves like a4, h4, a5 or h5. However, in a recent scholastic tournament my middle school kid got thrown off their game by an opposing player opening with 1) a4 ... 2) h4 (or something similar, I don't have the scoresheet). Ultimately, the other kid won the game because my kid didn't know how to respond and got rattled.
While I certainly want my youngster to learn good chess principles, I also want to be able to play games that are likely to be seen in games at this level, and I've seen several other games opened this way by players just learning the game (or using strange openings to confuse their opponents). Thus, I'm seeking some guidance on opening lines I could play against my kid to help prepare for future tournaments.
Edit to (hopefully) clarify things: I fully understand that good principles are important. I've done my best to teach them and have better players than me providing training. My kid generally seems to understand the principles and plays solid openings; even in the game in question this was done. However, after the game my child said that confusion set in because of the strange opening, which led to mistakes in the late opening and middle game, and thus a quick loss. This isn't surprising, as any time any person encounters an unusual situation they can get confused and make poor choices. My aim here is to play (occasional) practice games using these openings so that future tournament games in which an opponent plays such an opening is not confusing.