I actually see here other issues and I am not sure if I would like to sanction them by looking for an alternative in picking.
I would like to ask first for what reason your material is batch managed.
If that has to do with quality and expiration dates, then an approach to mix it with older batches, even putting new batches on top of the old batches so that they cannot be picked easily should be restricted, as this practice leads to the fact that only the last batch is picked and the older batch is always left and becomes even older and at some day expired.
Further you should not allow to have the people pick quantities that are already allocated to other TOs, as this automatically leads to corrections in 2 TOs.
If you create the TO after/while picking, then you have no corrections. Means if you create the TO by a function module call in the moment you scan it then it should actually work as you want. But this means you will miss another part in the process: the planning of your work.