I promise, the Reverie is substantially easier than the Arabesque. Don't be intimidated by the chords; if your reading skills are sufficient to follow the score, you can defo learn it.
But if you don't care enough about that piece to want to spend time on it, there is also the Des pas sur la neige:
For polyrhythms, there is also a tapping method, where you tap one hand along the piano or your thigh, and the other plays the notes, so you can hear it. You can do this tapping stuff even when you're not at the keyboard, just like while watching TV and stuff. Also, when learning 4:3 specifically the way they break down is like (let's say the 4 is in the LH and the 3 is in the RH):
(LR) L R L R L
What you can do to practice is drop the first (simultaneous) note, and just practice that LRLRL rhythmically. The rhythmic breakdown is as follows, where each dash or letter represents one beat:
LR-L-RL--
So it's a figure with 9 beats. Then to get 4:3 you just add a simultaneous LR at the beginning of that. You could break it down further and first learn LR-L-R, that's actually the "unnatural" piece. That's all there is to it! Just takes steady practice to get it ingrained.