The referees need to manage the situation properly by enforcing the existing rules, i.e. 6 seconds for a 'keeper to have the ball in his hands and cautions for undue delays. The reality is they just don't bother.
IMHO the outcome of putting things "on the clock" will be that there will be MORE time wasting as there will be no management of it whatsoever. This may result in 30 minutes of football taking over an hour - or in the worst case as broadcasters get their agenda into the stoppages in play the nightmare of what happens in NFL where a 60 minute game takes 4 hours to complete.
As an experiment it would be an interesting approach for dealing with the "additional time" at the end of each half.