So I did the Classic again yesterday. I did same day levain, kneaded by hand (I have a small, ancient KA) then split the dough in half to mix in the porridge in the KA. Kneaded it a bit by hand again, threw it in a Tupperware and into the fridge to do the bulk rise. Came back a few hours later and finished the baking. It worked great, loaves look lovely and doing the bulk rise in the fridge really frees up the day. I finished baking at 9:30 but I loved having the afternoon available to do other things!