You will miss some key workouts, that's life. Plan your key weekends and work around them. Some people do longer, but I find them tough. Use the long bricks as tests for food. Get excited about them, they are key.
Long rides are also good for testing nutrition, and finding out about shoe and clothing issues.
I never really did this. But you could plan a mini-ironman or something with a swim before your Long Brick, or lengthen one or both of the bike or run. You could use every 4th week in that case for a long swim if you're worried about the swim. For me, I don't plan any weekends around swims, but I do try to get in about three 3 km swims at Kearny Lake, on the run day of a long bike weekend, or sometimes on a weekday evening or something. I don't really say here what to do midweek except for the rest week.