What? no.
That sounds so dull and boring, good bye possession football and kill plenty of fun aspects in football then. Everything will be fast pace copy and past system of quick total all-out attacking and counter attacking for every teams when attacking, while defending team will be totally defensive because few mins and the possession will immediately be theirs. It's like basketball which I find boring and repetitive in terms of movements and area of playing by both teams. It's dull repetitive. Basketballs is fun when they make the skills, blocks, steals and shots, that's it, less on positioning and formation I feel which in football are far more important.
^ I think OP's good idea tbf is best suited for futsal/5v5 football or 7v7 football/turf, not sure what it's called.
Though this is about stopping clocks every delays so in the end we get a "real game of 90 mins" not this 60 mins playing but the rest are time wasted on delay throw-ins, waiting for the ball, set-pieces posing, fouls, VAR review, etc... which I would be in favor of. But then it'll make the game longer and may encourage some teams to time waste intentionally to get the extra time to recover fatigue or control tempo.
^ Instead we should use OP's "shot clock" idea during free kicks, penalty, throw ins and substitutions. Fouls or cards to be given if the players delay past certain time limits.
Eg. After whistle... 3 seconds time limits for set-pieces and throw ins. No more. Exceed it and possession given to the other teams. If any players took too long walking away, exceed 3 seconds, then that player will be given a yellow card. Etc.