Wouldn't it just be easier (for Palpatine not for us) to blow up the temple with most of the celebrating Jedi inside it.
Imagine that huge structure coming down and the chaos in streets.
Palpatine could blame it on Rebel Senators who were backing the Seperatists.
Heaven's knows how it could be done but it would be very cinematic.
He could then cover up the Jedi purge by saying he is really fighting a Rebel Alliance.