how's about reversing the last thirty years - which would take us back to 1977 but only for the soul element.
So basically we could do all the nighters and dayers again - and all the naughty stuff that went with that in reverse order.
Then when we get back to 1977 - or whatever year yer like, we just change things round so that we're back in 2007 again - no worse for wear. Also whilst we're on our retro soul journey no one from the present time would have missed us cos we would have changed stuff so that they were just suspended in a time trap thingy.
Well, you did give a lot of scope!