Something I do a lot is dash around with ICs to make Nana get in front of Popo. Dash dance, foxtrot, wavedash forward to back dash. Because Nana will move a few frames after Popo, you can make her stay in the front by doing a dash towards your opponent and then dash away again.
An example: You dash towards a Fox with both Climbers. He reacts and approaches with a short hop nair. You dash back again so that Popo barely avoids the nair while Nana still gets hit by it. Then you punish the Fox with a smash or by dashing towards him again with grab. Best case scenario: The nair sends Nana into the air, you get a grab and do a pummel with Popo, and Nana gets back on ground just in time to do a f-tilt. I've got a lot of low procent wobbles against many different characters by doing stuff like this.
But in general speaking, when ICs are desynced in most likely any way you should abuse the fact the your opponent probably is going for Nana. Predict how he is doing to hit her and punish him. Always stay ready to wave dash in while Nana is getting combo'ed.