I did some French with Japanese the other day. Some Polish too. That was definitely a first. And it reminded me of a link I had scribbled down earlier in order to remember.
The French Experiment looks like a useful site to start out with, and probably to continue with. I could introduce Sachi to French as well (after which she can boast of knowing 5 languages!).
It may be a good thing to individualize each language so as to differentiate them. That could be necessary so as to compartmentalize them.
French I’ll associate with Barbara Dineen. Polish with Hubert!