In the lore, becoming a Daemon Prince requires devotion to a specific god to the extent that they god raises them to Daemonhood. It's generally not possible to become an undivided Daemon Prince.
The gods did collaborate once to raise Belekor. However, he proved to be a massive headache for them, making it very unlikely they'd do it again.
I dont have the new battletome to confirm what the current rule is, but if DPs cant be undivided then that is likely intentional and meshes with the lore.
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