The other possible moves i see are; Bestow, Metronome, Natural Gift, Nature Power, Sing and Transform.
I think that only Normal type moves should be taken into consideration for a possible retyping (especially from the "Other" typed attacks).
That's because Normal type moves don't have any super-effectiveness to them and Normal type moves are ineffective against Ghost and do quarter damage to Rock and Steel.
These points could easily be adjusted.
Also the fact that when Dark type was introduced, the moves which got retyped were from Normal type.