That was how I arrived at the WBu version above.
White and black are both core to the deck. Blue is only needed for the 3 cmc engines. So blue could be made into a splash if you're willing to let go of Xerox (which forces you to strain blue count to support FoW and fetch differently to support cantrips). Cutting the blue stuff loses consistency and FoW protection, but you gain smoother mana and redundancy (4-ofs in 60 card build). That means seeing Sanctum and Estrid more often to really profit off the deck's unique advantages. Multiple Paladin Class and discard are then necessary to protect you from disruption, without Forces in the deck.
It's not quite a bad BW aggro deck. It looks like that against combo, but against fair creatures you still have the midrange plan of T2 value enchantment -> T3 Estrid/Aminatou -> snowball out of control. Trial of Ambition could replace some other slots.
I don't know if it's better than what you already have, but it is an option.
Edit: What about SB Doomwake Giant? It's slow but answers token spam. Might be worse than just playing Detention Sphere.