#2 Finn Balor
If WWE are adamant that Roman needs to be a champion on Smackdown sooner than later, then there is always the Intercontinental championship held by Finn Balor. This could prove to be a good option as well, especially since Finn Balor has the undefeated Demon King persona up to his sleeve.
Roman has not yet faced the Demon and this feud could very well help the fans see a side of Roman that has not been showcased yet. WWE could portray Roman as the underdog against the Demon, in a quest to win the coveted Intercontinental Championship. This doesn't imply that Reigns needs to end up winning the IC belt. It would, however, engage Roman in a meaningful storyline. It is important for the fans to see Roman earning his spot on the card, and pursuing the 'workhorse' title against an exceptional talent in Balor will be a step in the right direction.
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