Depends on where you're putting the valve stem nut. And what you expect an "adapter" to do for you.


Keep in mind that the tube is pushing against the tire side face of the rim.
Most people put the valve nut - or their preferred choice of Schräder/Presta adapters - on the hubside face of the rim.
Where, on a double wall rim, it won't do a thing for protecting the tube against damage.


An adapter used on the hubside face of a double wall rim gives some protection against dirt or water entering the rim via the gap around the valve stem, that's all.


Putting a valve nut at the base of the valve stem would "work" as a Schräder/Presta adapter, but comes with its own issue of forcing the tube to follow a rather sharp contour when it transitions from valve stem nut down to rim strip.
Some think it helps, some don't.