What is the complete list of ExportPacket formats?

Question

ExportPacket is the most fundamental way we can turn Box forms into string data in other formats via the FE.

For example, a classic way this works is:

First@FrontEndExecute@
  ExportPacket[Cell@BoxData@ToBoxes@Hyperlink["asdasd", "asdasd"], 
   "PlainText"]

"asdasd"

Or

First@FrontEndExecute@
  ExportPacket[Cell@BoxData@ToBoxes@Hyperlink["asdasd", "asdasd"], 
   "InputText"]

"Hyperlink[\"asdasd\", {\"asdasd\", None}]"

It's enormously useful, but obviously entirely undocumented.

Now I'm interested in figuring out what other options it can take. Currently I've scraped up the following formats:

{
 "PostScript", "InputForm", "GIF",
 "BoundingBox", "NotebookString",
 "EnhancedMetafile", "Metafile", "MGF", 
 "CDFNotebookString", "PDF",
 "PICT", "BitmapPacket", 
 "InputText", "PlainText", "DefaultText" (* thanks to John Fultz for this one *)
 } 

But it can take more per John Fultz

So what's the complete list of formats? As a real long shot, what're the other options it can take?

---

Scraping notes

For those interested, I just scraped those formats from the DownValues of various Export functions:

System`ConvertersDump`installSource[
  DeleteMissing@
   Flatten@Lookup[Quiet[getFormatExportData /@ $ExportFormats], 
     "Sources"],
  Automatic
  ];
epfuncs =
  Quiet@
   ToExpression[DeleteDuplicates@Join[Names["*`*"], Names["*`*`*"]], 
    StandardForm, 
    Function[Null,
     If[FreeQ[DownValues[#], ExportPacket | FrontEnd`ExportPacket],
      Nothing,
      #
      ],
     HoldAllComplete
     ]
    ];
epdats =
  AssociationMap[
   Cases[
     DownValues@#,
     p : (ExportPacket | FrontEnd`ExportPacket)[_, type_, opts___] :>
      {
       "Type" -> type,
       "Opts" -> {opts}
       },
     \[Infinity],
     Heads -> True
     ] &,
   epfuncs
   ];
Cases[Flatten@Values@epdats, ("Type" -> t_) :> t] // DeleteDuplicates