You could make or prep a french toast / savory bread pudding casserole and freeze it,
Here’s an example (but of course it can be much simpler 
). Also this Nigel Slater one you had recommended to me.
I like the crouton idea too, though they’d be a bit delicate to use in something like panzanella, but maybe for salads.
The Zuni-ish bread salad with roast chicken is delicious, and would probably work with other proteins.
Or you could just slice and freeze the rest for future eggy bread.
There’s an indian savory twist that’s quite delicious — masala french toast.
