You are assuming the soaker knew something about revenues and would know the stock transfer was a potential provisional overprint and not just a cancel.
Perhaps. But I also know that in 52 years of collecting and studying revenues, I have never seen this or anything similar. And since the basic stamp is VERY common, and the ability to create a hand stamp similar to this one is also VERY common, I am going to go on the side of the probabilities and so I see no reason to think it is in any way a genuine usage.
This aside from the fact that future deliveries were generally agricultural events and had nothing to do with a situation where stock transfers might be taking place. Although anything is possible.