Some of the routines you see programmed will be redundant. Planks are important to train regularly because of how they strengthen the core. If you can easily hold a plank in each position for 30 seconds then increase the length of time.
For your handstand holds- if they are easy, work on kicking one foot off or challenge yourself to try a free standing. The goal of this sequence is to head from one movement right into the next without resting.
5 rounds of:
30 Second Handstand Hold
30 Second Plank
30 Second Side Plank (30 seconds on both sides)