Hi there!
I think it could be possible by adding this as a plugin, right below the message manager:
{ const Alias = Window_NameBox.prototype.baseTextRect Window_NameBox.prototype.baseTextRect = function() { const rect = Alias.call(this) rect.y += 2 return rect } }
Change the 2 to any number you want. Including negative, like -2. This will change the Y coordinate of the namebox text.
I don't know if it will work for you, because I don't know exactly what your window skin look like.