BuddyPress.org

If I use a new theme and rename it default it will change all the old blogs to the new default. However, all I am concerened with is forcing the buddypress theme as the new default theme. I am not interested in Andrea’s solution for new blogs, but thanks for trying. I am only interested in changing the old blogs all at once to the new buddypress theme using a child template. Or does anyone know a script like @r-a-y has suggested?