It would make a great opportunity for NPC interaction and storytelling to do-away with the 'shrines everywhere' design choice and add huge Shrine Zones.
In a Shrine Zone, players must go well outof their ways to visit the Shrine and donate via an NPC. These Zones would require unique art for each Giant. The NPC curators there would be dressed in appropriate attire for each Giant as well.
Also, there could be different events at the Shrines where processions are done and players can participate.
Finally, the Drop-off Shrines could stay, and these could be in addition to those. But, I would prefer the Drop-offs to go away. That's just me.
Let me know what you guys think.