Here is the level Si! We do not add anything extra for rhythms but we do take away some more colours! You have the choice between Do-Mi without colour adaptation , or Do-Fa without colour. I put them all together and let students pick their own music.
Some students struggle with the colours leaving, just make sure you bring their attention to looking at where each note falls (on the first line, in the first space...etc). Non of these songs move more than a major third at a time so students start unerstanding walking up/down, and jumping up/down from one note to the next.
I have a couple copies of each "song" just to make sure there is always enough to go around.