OneCNC has a sort function for holes, it may be able to do what you need. Although it's feature recognition will sort full arcs into groups automatically, if you place points at all arc centers, then it will drill by points only, in which case it should sort the whole group. If you want to post an nc file or a dxf, I'll run it through and send you back the results.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)