I have a couple ideas.
First, Teach-OK works best when you diversify your partnerships. If you haven't already, do the following. Number your kids 1-18 by their overall academic ability (never share this with them, this is just a tool for you). 1 gets paired with 10, 2 gets paired with 11, all they way down to 9 getting paired with 18. This way every partnership has a "leader" and a "follower" (you number these 1 and 2; they know their number but not what it means; make it seem arbitrary), but they are not so different in ability that they can't relate at all.
Secondly, as far as reading I agree with lordtech that SuperSpeed is the way to go. Start with Letters and Phonics for sounds, and then move to 100 for sight words. These will be great, as your year 4 kids are probably well aware that they are behind (even though they may seem like they don't care) and won't respond well to anything that feels like remediation. Instead of that you get to tell them they are learning a new game! Use it as a reward to increase the effect.
Finally, make SURE you are using gestures as much as possible. IMHO this is the part of Whole Brain Teaching that will be most effective for your kids that are learning English as a second language. Adding the gesture gives further context to academic vocabulary and will be a HUGE help. Also you might make some custom Malay-based gestures. A great gesture someone just posted on here for "isosceles triangle" is to point to your two eyes (calling to mind that the beginning sound of "isosceles" in English sounds like "eye" ) and then draw a triangle in the air. You could do the same kind of clever thing, but call to mind the sound of a related Malay word. Hope that made sense.
Good luck and stay in touch!