Train a two-combination sequence into a strike, and force it to be performed on both sides. The mirroring means the lay-off, the turn and the finish all have to work off either foot.
Build the same setup either side of the goal: two mannequins and a starting marker on each. The sequence is a one-two, then a forward pass to a third player, then a lay-off back into the path of the striker, then a finish from around twenty metres. Run both sides alternately, and make every player complete the sequence on both. Two balls, one per side, so a strike is always going in.
Symmetrical setups are common and genuinely two-sided sessions are rare. A coach builds an identical pattern on each side of the goal, and then the group runs it eight times on the right because that is where the queue formed and that is the foot most of them prefer.
The reason to be strict about alternating is that the two sides are not the same exercise. A lay-off arriving from the left and a lay-off arriving from the right require opposite turns, opposite controlling surfaces and, if the sequence is being done honestly, opposite striking feet. A player who does thirty repetitions on one side has practised one of those.
The combination itself is worth more than a single wall pass. The one-two beats the first mannequin, then a forward pass involves a third player, then his lay-off releases the strike. That means the finisher has to read a combination he was not part of for one of its three passes, and time his arrival on the lay-off rather than on his own pass. It is a step harder than a give-and-go and closer to how a chance actually arrives.
The fault that quietly undoes everything is shifting the ball onto the favoured foot before striking. It looks like good technique, it produces a better shot, and it means the mirroring achieved nothing. Insisting the strike is taken with whichever foot the side naturally presents is uncomfortable for a week and is the whole reason to build the drill twice.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.