You would need batch update, but exactky how it woudl work depnds on how you manage your data. For example it would be possible to get the batch update to bring the  survey events and samples)  into line  with Location for every entry in the database, where the spatial reference qualifier is  of  a specific spatial_reference type ( eg site centroid). Alternatively you could just apply the batch update to a selected Location . The Batch Update would need to check that the new  Spatial reference was with the bounding box of the  Survey.

I can advise further  and/or provide an example, but would need to understand a little more about how you would like it to work.