It's pretty much a solved problem for the last two decades. You can use the shape of the wing and fuselage to broaden sound wave, and go supersonic at an angle

It's pretty much a solved problem for the last two decades. You can use the shape of the wing and fuselage to broaden sound wave, and go supersonic at an angle of attack that sends the brunt of the transition sonic boom above the horizon or at least on a long trajectory to the ground.