I have been doing my training for this and have come accross this a lot. The way i see it is takeoff climb to 500ft, turn to track overhead the aid and remaining in the circling area if in IMC and climb to LSALT before departing on track, if in vmc and visual with the ground, depart as normal and intercept track as normal.
When climbing overhead in IMC then climbing to your LSALT for your first sector is safe as you are remaining in the circling area and therefore are pretty much guaranteed to not hit something. As long as you reach LSALT before leaving the circling area you will be right.