Well, listening to some of the examples in the article and trying my luck, the first thing that comes to my mind is that maybe they should complement the challe

Well, listening to some of the examples in the article and trying my luck, the first thing that comes to my mind is that maybe they should complement the challenge- if not replace altogether- with a pronunciation bee. Opificer is read as "huh-pificer", but the common pronunciation, and the only one that makes sense to me, is "oh-pificer" (the stress varies freely as well in all the examples I found online). Hechsher (presumably with a hard "ch" sound) is pronounced heksher. The french word "Beurre" is happily pronounced "bur", without any attempt to a french sound. Don't know enough Spanish tell the correct pronunciation of Pejerrey but I'm pretty sure it's not "payray". If this is how it works, it seems a double challenge: first guess which word they're actually trying to pronounce, then write it down correctly.