If you have access to a pool, water running can be pretty effective.
Find a pool that is deep enough for you to not touch the bottom, and with a floaty belt (or not, I prefer not), pretend to run, without touching. The key is not to touch the bottom and possibly hurt your toe.
I.e. Make the running motion, arms and legs, through the water. Assuming your toe can take the waters resistance.
You can focus on the muscles used for running and form, (Easier to focus on form with a floaty belt, but better workout without it) but you lose the benefit of impact (which the toe is obviating anyway.
I have found this fairly effective, when injured, that disallows impact on joints.