Hi, where in GH are these functions (especially SwapUV)?
Some plugins have it, like Pufferfish or Lunchbox.
And without the plugin in any way? 
Rhino 
or script it in the C# or VB component: https://developer.rhino3d.com/5/api/RhinoCommon/html/M_Rhino_Geometry_Surface_Transpose.htm
https://developer.rhino3d.com/5/api/RhinoCommon/html/M_Rhino_Geometry_Surface_Reverse.htm
What is the SDK? And VB? Where can I find out more about the scripts?
SDK = Software Development Kit (Archaic term used in the old days when only developers played with code).
VB = Very Bad Thing (use C#).
Other than that see attached.
Surface_RebuildTransposeReverse_V1.gh (124.8 KB)
Thanks!
Added Span related info when rebuilding.
PS: Notify if you think that a far more elaborated C# (analysing surfaces) could be useful to you - most notably if you have plans to start learning how to code.
Surface_RebuildTransposeReverse_V1A.gh (127.3 KB)
Yes, I am going to study C# in the near future, the code generally well expands the possibilities. 
What is this for?
A = amplitude (of the demo normal vectors at u,v: [0,0], [1,0], [1,1], [0,1])
BTW: For your future C# adventures: replace the native components used with code:
Surface_RebuildTransposeReverse_V1B.gh (136.6 KB)
Cool! Thank you!