Would not recommend. Some where in the rubic, it says something about how its supposed to be an analysis of your related in conjunction with the prescribed. The structure you mention lacks depth for an analysis. And what is your plan for the 3rd body?
For me, my structure was:
One related:
Intro
Body 1: idea 1 (prescribed)
Body 2: idea 1 (related)
Body 3: idea 2 (prescribed)
Body 4: idea 2 (related)
Body 5: idea 3 (prescribed)
Body 6: idea 3 (related)
Conclusion
For two related,
Same except I would add discussion of my second text with my first related in the same paragraph.