Actually, there are some studies that support the use of thrust manipulation of the upper back in the treatment of neck pain. Using manipulation to realign the mid-to-upper spine has been shown to provide immediate neck pain relief.
There are also some studies that show neck motion improves following this type of treatment. The results are measurable and last for at least six months (that’s as long as the studies followed patients).
It’s possible there are continued good long-term benefits but this hasn’t been studied yet. It’s also possible that there is one type of thrust manipulation (i.e., specific technique) that works better than another.
In addition, the differences in treatment outcomes may be based on the location of the problem within the spine. Perhaps the position the patient is in (sitting, lying down) when the manipulation is done makes a difference, too.
There’s plenty of room for additional studies but for the moment it looks clear that your idea has been investigated and has some merit!