Hey, so because of this thread I decided to write a userscript, that changes the expected reading of all kanji cards to on’yomi (except if there is none).
Of course it doesn’t change the mnemonic and what it says on the lesson page, but all quizzes will test you on the on’yomi reading instead. There’s also an option to make both on’yomi and kun’yomi accepted for normally kun’yomi only kanji.