Afterschool "Nanny share" for Washington/Malcolm X kiddos?

Hi folks, 

I'm trying to plan ahead for next year - my youngest will be starting TK and who knows if my 1st grader will get into LEARNS again. We've done New School (great, but a whole other school system to deal with and $$) and we're on all the COB wait-lists. And except for New School (which was overwhelming for me - I could not pull it together for the volunteer days, on top of Washington and our preschool), all the options have been way overstimulating for my big kid. I just want my kids to come home and chill out, but I can't mediate or entertain them.

I want another family (or 2?) that have kids at Washington (or Malcolm X)  that want to go in with a nanny/babysitter/caregiver Monday-Friday from 1:30/2:30 - 4:30/5pm. I think proximity is critical for it being successful, since we'd likely have to pick them up (or negotiate that anyway) - we're in South Berkeley near Ashby and Sacramento.

Our house is small but we're happy to share hosting, are a few blocks from San Pablo and Haskell Mabel Park - I envision quiet afternoons of walks, doing art, encouraging solo play, Play-Doh, sandbox, etc. 

I have no idea if we can find someone willing to commit to this for a year (UCB student??) but honestly, finding aftercare is already a f***ing nightmare but this might work better for our family if a another family or two were to get on board.

Anyone interested in getting off this aftercare nightmare roller coaster?