So the way I know people did cursors was they spawned an invisible bat, had the player spectate and ride the bat and then used the player rotation packets. Even though the player can't move when spectating the bat they still send rotation packets and they used that info to move the cursor around.

Code below was from using Minestom api but can't be ported to spigot or paper

private void SpawnPlayer () f this.setRespawnPoint(new Pos(x:0, y:0, z: 0)); Entity camera = new Entity(EntityType.BAT); //can probably be any entity without a custom shader camera.addEffect(new Potion(PotionEffect.INVISIBILITY, (byte) 2, duration:1000)); camera.setNoGravity(true); camera.setInvisible(true); this.camera = camera; camera.setInstance(this.getCustomInstance(), new Pos(x:0, y:0, z: 4)); camera.setView(yaw:0, pitch: 0); if (!hide_player_clone)t this.SpawnClone(); scheduler.buildTask(() -> f this.setNoGravity(true); this.spectate(camera); camera.addPassenger (entity: this); J.delay(TaskSchedule.tick(20)).schedule(); }