I would personally use Util’s “select_plus_next” with a keybinding (I’ve set mine to T).
For additional context, I’ve set Deselect All to the keybind CTRL+D.
I’d navigate to the first top point and repeat this sequence:
T+T to select the right slope, Shift+Arrow Down until the bottom point is at 0, CTRL+D to deselect, Up Arrow to go to the next top point. Repeat until all points are adjusted.