You already have control over the ordering of your photos and whether the HDR/Pano is next to the originals or at the end.
The reason it's at the end is likely that your sort order is set to Added Order, which I believe is the default.
In Library, using the Sort option in the Toolbar below the main image area, you can change your sort order to Capture Time or perhaps File Name, and your derivative photo will be sorted next to its originals.
If the toolbar is not visible press the T key.
If the Sort option is not visible, then click the little inverted triangle at the right end of the Toolbar and put a checkmark next to Sorting.