You can make new ancillary kits by going to Database > Ancillaries > Type of Ancillary at the top > drop down to Ancillary Kits. I'd copy one of the kits you have and change the support rod size and rename.
FYI Revit will only show you kits in the drop down on your hanger if the kit has a support rod in its contents. Any other kits will not show.