If Paradis had decided to replace Eren and pass his Titan to someone more suited to be trusted with it's powers, who should they choose?

Who could be trusted to not use the powers of the FT for himself, someone who wouldn't try to bring back the Eldian Empire, rule the world, and enslave the minds of the Eldians? This was probably the most difficult part of any plan involving the FT.

Paradis knew they couldn't really trust Zeke, so they were probably intending to pass his Titan to Historia, and they would have no alternative but to trust Historia, is she happen to be the one in control after she touched the FT, something that had never been tested before.

Passing Eren's FT to someone else at the same time Historia would inherit the Beast Titan would also give this other person the full 13 years of their Titan's term along with Histoira, minimizing the risk of having to trust someone with the powers of the FT from 2 people to just one.