Intention

I like the idea of switching with someone. Is it someone you're particularly close with? If not, I worry that most people won't understand. Also, do you two have distinct enough styles that people won't think it's merely a coincidence? I feel like you have to go very over the top with this idea to make it work, but if it works, it'll be very good. Very entertaining, which seems to be your end goal.

I really love the idea that doing this project with someone else. Because we are no longer restraint to our physical appearance to express opinions thanks to internet, we are allowed to see how strong that people will expect someone would following his personality pattern. And, to do this with someone else will enforce the effect because it sometimes might be not noticeable that someone changes his/her personality. Two people switching personalities can cause a stronger effect. I think it can be a lot of fun.