I am already aware of the problems in Train like a Pro 1 and 2, Brilliant Endgame Plays (精妙收官) by Kweon Kap-yong, Weiqi Kyu and Dan Level Test (Beginner Level Test with 1000 questions) 围棋级。段位测试.

I'm essentially looking for a book like Brilliant Endgame Plays, but perhaps on an easier level. Does anyone know of any other books that have this specific kind of endgame problem?

I recommend Get Strong at the Endgame, which includes both endgame tesuji problems and 13x13 problems in the style you are seeking.