Yet another puzzle: It's only 4 4 moves

Well, your version is certainly sound. I wasn't trying to accuse you of not citing the original (sorry if it came across that way) - it seemed clear that it was an on-the-fly offering.

solved the one of #17: d4, e6, Bh6, Qg5, Qc1 Qxc1, Bxc1. This one was way easier than the first two ones.

Well, this took a while! :)