I've been thinking of this for a while myself since I am going to narrow my Bees rear, I thought I'd swap B&E rears and just chop up the E body rear for the B body. I'm glad I read this... I never really thought about the rear sway bar not working.

I might just relocate the perches on the e body rear with Dr. Diff's kit and add rim width on the back side instead of swapping rears.