It's been a few years since I was really looking at this stuff closely but from what I remember....
There are two versions of the Smart Junction Box, one with the wireless functionality, one without. I don't remember exactly which van configs came with what options but logically, it would make sense to me that bare bones vans without power locks and without power windows would get the SJB with less functionality. It would also makes sense that if your van has TPMS, you have the wireless functionality in the SJB but the keyless entry is turned off.
The part you have a picture of, as already pointed out, is the RFID chip reader that is only functional on vans with PATS (passive anti-theft system). I don't believe it has any connection to the keyless entry, it's only used as an ignition cut if the right key isn't present.
If your van has power windows and power locks and TPMS, it is likely that you can turn on the keyless entry with Forscan and not need the dealer tool. There's not a lot of information out there about what parts of the As-Built data are related to keyless entry but my guess is that you could find out with a little detective work.
Find a van that's similar to yours that has keyless entry (same drivetrain and as close options wise as possible). Download the As-Built data for that van and your van and run them through the As-Built compare tool (link available through the Forscan helpful links page)
https://forscan.org/forum/viewtopic.php?f=16&t=4393
You'll see side by side all of the differences between the two configurations. the module you're most interested in is #726. In my (years old notes) my guess at the time was that lines 726-04-01 and 726-10-01 might have had something to do with keyless entry.
I've looked at dozens of As-Built files for Ford vehicles. It's tedious and sometimes difficult to find what you're looking for. The last time I used Forscan on an Eseries, there wasn't a great user friendly interface like they have for other vehicles. Maybe with the latest version, that has changed...but don't have high expectations of a big button you click that says "Keyless Entry On".
I have a van here at the shop that is a strange config in that it has no power windows or power locks but it has TPMS. It's a bare-bones passenger van. The only van I've seen with fewer options was a 2010 cargo van...and that van had NUTHIN' besides the parts to make it run.