Would you class the 'shadows' Vader on a green holo card, a variant?
I don't know how to class it as it is not a variant of the original, it's a different figure altogether
R5 D4 had alot of variants between straight and L latches on all the different cards.

I don't go in for these usually, but if I know of a variation (it has to be on the figure as I am an opener) beforehand I will try to look for it, like bloody stump Luke. I would not buy 4 Lukes for the variations. I am having enough trouble trying to get one of each let alone multiples.

I don't collect vehicles, but the one that could bend my arm is  a sail barge. I know it won't happen but it would be so cool.

What is the full make and model of Queen Amidala's Royal Starship?

What is the proper name for the Bespin Security guards?

Over here in the UK (not that it is much help to you) the rarest (IMO) seem to be;
R2 Q5
Sandtrooper
Clean Scout
MOTDS

I still need 23 of the line and these three I don't see anywhere

Thats it.

Is it Gran?

Yep