Anywhere to buy sourdough starter in South OC?

[paranoidgarliclover]

I have a question about modifying recipes for diff flours. Didn’t want to hijack the thread, so I posted here:

The Bread Thread

Have been reading about the various flours that posters use in their thread in another thread (Anywhere to buy sourdough starter in South OC?) and was wondering… When people use a diff flour, how do they modify their pre-existing bread recipe to accommodate? I typically use long proving recipe (like the Forkish recipe for overnight country blonde) and am wondering how flexible that is, if I use something to substitute for the white flour. That recipe also uses whole wheat and rye, which I thi…