There was some concept art for good/evil versions of various characters for Battle Front 4 (https://cdn.mos.cms.futurecdn.net/5DsubZdeLNvKxKsVCBRHaB-650-80.jpg)
As far as shoe horning goes - I think they really missed an opportunity not linking Qui-Gon and Dooku into one character somehow.
Alternatively - what if Dooku is leader of the council in Episode 1? Or just swap Mace Windu with him as Yoda’s second in command?