Yes very useful, removed a complete set of locking wheel nuts from my Sons Golf
when the key got lost. I soaked them in WD40 first, as they were a bit like yours.
make sure you get the right size one as there is also a 1/2 drive one.
Provided you go easy that should do the trick.
We've got one in the garage.....worth its weight in gold provided he nut is small enough.
Should be ok on yours though