Agreed - in fact I've always thought rewritten this looks an even more beautiful equation:

-e^(pi.i) = 1

Four abstract concepts on the left surmising thousands of years of mathematical progress, create the most fundamental concept of all...

Perhaps a little over dramatic, but elegant nonetheless!

Or just get it from a truly random source - for instance perhaps use a sensor pointed at the sun that measures something it emits. No satellite required then.