Cubing Challenge #4 - Only double moves are allowed [DE]

In this Cubing Challenge, we will only shuffle the Rubik's Cube with double moves and then try to solve it with double moves only. We will develop some interesting algorithms for this ...
The book mentioned at the end is:
Singmaster, Notes on Rubik's Magic Cube,
maths-people.anu.edu.au/~burk...