That's all, Curios is much more used than Trinkets and it would be nice to add compatibility between Paladins and Priests Spellbooks and Curios

Curious was never supported.

On Forge you can put spellbooks in the offhand slot to cast spells.
Or install Accessories mod alongside the following:

• Trinkets
• Acessories
• Trinkets Accessories Compat mod

@ZsoltMolnarrr Strangely, having the spellbook in my offhand and Holy Wand in my main hand isn't working. I have several spells in the Holy Book and they are not showing on the bottom left of my screen, only the spell from the Holy Wand.
Also, sorry to bother you but I have another issue. Could you possibly add a config to disable the custom third person animations from the mod? They conflict with other animation changing mods on Forge and cause the screen to be blocked by the player's head. Thank you

@Mqony

Just test it out and with a spellbook in offhand and a sword in main hand, with healing runes i was able to cast spells from paladins book