If you try to apply both warp stabilizer and speed change to a clip in Adobe Premiere Pro, you will receive an error message. This video shows a quick workaround so that you can apply both!
– In Timeline, right click a clip and choose Speed/Duration and then change speed.
– Then right click clip again and choose Nest
– now you can apply the Warp Stabilizer to it by dragging that effect from the Effects Panel onto your clip in the Timeline