I'm still experimenting with my sourdough made using the breadmaker from sponge to loaf. I think I'm close.
My breadmaker is an elderly Breville but it does give me the opportunity to manually set up a recipe. Based on other recipes that come with the breadmaker and what's needed to make a sourdough loaf, I've tried a number of manual settings now. While the loaves are fine, they are difficult to remove from the bread pan - small price to pay for automation IMHO.
Once the sponge is left overnight to rise and become active, the process takes between 5 and 9 hours, which isn't too bad. I'm thinking that the process will take longer in our Winter than it will come Summer.
Keep tuned for the recipe.