If I may: I don’t think this shot would work in the movie, because the character is a complete nobody at this point, and his mysterious presence distracts the audience from the elements involved in the narrative so far (it’s like the Boba Fett cameo in EpIV, when we didn’t know the character would be known sooner in the saga). Would work better as a flash back during EpII, when the Count questions Obi-Wan and reminds him that Qui-Gon was once his apprentice.
That being said, I like the idea of Dooku appearing in the whole prelogy. I’m simply trying to judge it as someone who would know anything of the saga and who discovers EpI the way you intend it to be.