I doubt this will happen any time soon, but in the comics, the current arc of the Flash involves Reverse Flash building his own “Reverse Flash family” to combat Barry’s own team. Right now, he’s trying to recruit the Rogues, and ultimately recruits Trickster. However, I have a better idea of how the show can do this.
What if the “Reverse Flash family” was made up of most main antagonist of the series (except Cicada, because his powers would render the whole team up pointless). So, the line up would include
Reverse Flash, in his original Matt Letscher form
Godspeed (since he’s supposedly going to be the big bad of season 7)
Red Death (because they hyped him up in season 5)
And as incentive, Thawne can offer them all something besides killing the Flash.
Promise Zoom and Savitar a chance to escape their fates (maybe by using the Negative Speedforce)
Devoe a mini enlightenment
Bloodwork, an army
Godspeed, more speed
Eva and Red Death, whatever they want
But that’s just an idea, what do you guys think?