|Do you.. Bolieve?|
Here's an idea. Have Bo come out dressed in an all white suit, including a white tie and white shoes. They should go full televangelist with it and have him look like he's trying to resemble an actual angel. The New Day lads have honed the televangelist promo style but they're not using the look. That's still wide open and Bo would fit it well.
With this new look could come a new focus in promos. Instead of just setting himself up for his punchline catchphrase Bo could spend a few weeks or a month talking about how he wants to help WWE Superstars™ who are floundering and struggling. Interrupting random matches on SmackDown and getting segments on Main Event would be enough to get this new approach across, with it being made clear that Bo's looking to help lower card lads.
After a few weeks Bo could reveal the guys he wants to help, interrupting a match involving them or simply calling them to the ring during SmackDown (this clearly isn't high profile enough to get air time on RAW). There are a few options for this. Bo could tell Cutis Axel and Damien Sandow that they're better than imitating people from decades ago. He could tell Fandango and Adam Rose that they're both great athletes not being taken seriously because of their silly gimmicks. He could tell Zack Ryder that management aren't interested in him despite his hard work and that he hasn't been relevant for years.
They're all middle or lower card guys (whether they deserve to be or not). The diea should be that Dallas recruits them to be Bolievers and becomes their manager. Let him manage two guys, give them new all-white ring gear (maybe have their names in black on them or something) and use them as a tag team. You'd have a new team, a new use for Bo Dallas that plays to his strength of being both irritating and ridiculous, and something for guys who are currently directionless.
You would also have the option to imply that Bo is some sort of sinister cult leader who's brainwashed guys into being Bolievers. That may not sound like anything particularly novel in and of itself and it wouldn't be. But it's worth noting that Bo's real life brother is Bray Wyatt, a man well established within WWE canon as a cult leader. Doing something similar with Bo would create the option to play the cult leader thing up in a future storyline. It's an idea that does things short and long term.
But it won't happen. Obviously. Nobody in WWE writes for the mid-card anymore.
1 It's possible they're concerned about upsetting big Christianity fans in their own locker room or religious groups outside the company. But that argument doesn't really tally with them referring to Brock Lesnar as the Devil or the continued depiction of The Undertaker as a demon and-or zombie.