Originally Posted by The Overlord
Except this movie would be about Spider-Woman's origin and Spider-Woman's origin is tied to Hydra at this point. Viper makes more sense in a origin story then Morgan does.
Sometimes you can't start out with with the hero's nemesis in the first film. Mandarin is Iron Man's nemesis, But the film makers with Iron Monger as the villain from the first film.
As for whether Viper should Spider-Woman's mother, that plot point only work in a movie if Viper were in her 40s. So it depends whether the studio will want to have two woman in their 20s fight or one woman in her 20s and another in her 40s.
Well, unless Viper is made subject to the same age retardation process that Jessica has undergone (as a result of Jonathan Drew's experiments and the High Evolutionary), which could allow Viper to have been present during pre WWII and still appear to be the same age in the present. However, Jessica was also in semi suspended animation for decades. However, unlike Steve Rogers, who was completely frozen, Jessica did continue to grow, but just aged at a very slow rate.