But not making her character would completely disrespect the film. She is the hero.
In fact I am disturbed that some people here watch the film and seem to dismiss her in favour of a clearly secondary character like Vickers. Sure Théron is prettier and she has the violent scene with the flame thrower, but again elevating that above Shaw's heroics seems pretty messed up.
Shaw was a very ham-fisted, pedestrian character portrayed by a not-very-good actress. That's why I don't give a damn about her. At least David & Vickers are interesting and given life by solid performances. And an Engineer/Jockey figure would just look cool (important for $200+ collectibles).
If the Shaw is the first/only figure revealed, the line will sputter and go no further (unless space jockey is already in the works, too).