A solution to 3v3 Timewasting!

I've seen people suggest a shot clock. I personally HATE this idea, it either will be done poorly and not fix timewasting or it will kill the "fast paced" nature of the game imo.

Instead I would like to propose a simple idea that would "fix" timewasting, and would also add a little extra cool dynamic to attacking in 3v3, especially when up a goal.

The idea is a literal "Wall" (think of it like a forcefield) that moves up the pitch on a timer, so after 10 seconds of possession it could move up to the first point, gradually moving up further until it reaches the half way line, where it would stop at around 25-30 seconds of possession.

Players can move through the wall freely, however the ball cannot go through the wall and would bounce off of it. If a player attempted to go through the wall with the ball, the ball would be "tackled" with/without a stagger (this is kinda up to balance). Once the other team gains possession of the ball, the wall would disappear.

The point of this is that keepers and players would be able to bring the ball up the pitch, they'd still be able to dribble and build up an attack AND keepers/players would be able to sit in net/play safe, effectively just making the pitch smaller if a team is timewasting, and giving the other team a smaller area where they can press without worrying about leaving the net so open.

Here are a few links to basically show how it could work:
https://tactical-board.com/animation/50e49499eacaaf_bfuk - the keeper plays up, gets pass off as wall moves up.
https://tactical-board.com/animation/0bc70426ad6fb6_bfuk - the keeper is timewasting, is forced to move up the pitch with the ball as the wall moves up.
https://tactical-board.com/animation/28cb6444fc45da_bfuk - a player tries to bring the ball through the wall.
https://tactical-board.com/animation/8790e4dddb76ed_bfuk - the ball can bounce off the wall and be used creatively (like the backboard for example).