I would like to sort my feature class in a model based on coordinates stored in its attribute table. The sorting must be done on Y_coord descending, then X_coord ascending. The answer to Sorting feature class to calculate sequential ID field using ArcGIS Field Calculator? looks like what I need, except I only have an ArcEditor Licence, and free versions of Xtools Pro and ET Geowizards. My model performs several other processes as well, so I need the sorting to be included in it. How can I perform the sort with the above limitations?

However, looking at the options in the Sort tool, I've realised that what I actually want to do is sort my features spatially, starting from the upper left, but to sort based on the Shape field requires an ArcInfo licence. The sort tool from ET Geowizards does not allow sorting on this field either. Are there other tools which could do this?