In a recent episode, Cisco has shown that he can vibe different realities (he was able to vibe a timeline where Barry stayed in Flashpoint). What if Cisco accidently vibed a timeline where Wellsobard exists (This could be a way for the show to introduce the original earth 1 Wells, but that's a topic for another day) and what if Wellsobard escaped? But this time, Wellsobard he wants to redeem himself to Team Flash, and he helpsBarry fight some of the villains (without Team Flash knowing) and also secretly is getting information from the villains in order to stop them from defeating The Flash. I imagine the villains being like the Rogues.
Anyways, one of the quotes I have Wellsobard say in my outline is: "All those years I thought I was your sworn enemy, not until now, have I fully accepted and realized that I could change my destiny, and now I'm your biggest ally. Destiny is never set in stone."
So, would anyone like Wellsobard to return?

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It could work... maybe.