As with everything else, you have to prioritize - there will never be time for everything. Meal prep and home exercise alone can cut that schedule down to 60-90 minutes, so you can begin on the side project at 7.30 pm.
7.30-9.30 would give you 2 a day. Say 2 nights and then on the weekends. 8 hours a week. That isn't much but the trick is to do something quite focused.