I don't think I like the thing that I did, which is mirror the Siv drops to the Tarhyl mobs nearby. I think that what I'll do instead is add a script widget to all the diety-aligned mobs, such that you can hail them and if they have what you need / trigger what you need they'll have a dialog option for you to simply ask them for it. Being the greedy cockbiters that they are, they'll no doubt want something (coin? quest drop? idk) but it won't be that bad because you'll have to pick through the mobs to find it. It's also quite possible that none of the mobs will respond to your hails, so you may have to come back later (though they'll reroll themselves on their own, you won't need a group to have cleared them or anything).
Glad you like 'em, and no, it's not an oversight--the NPC in question is pretty up-front about what the reward will be. It's actually a relatively important clicker and I wanted people who weren't around during LoM to have access to it. That said, it's not QUITE the same as the LoM clicker (it has better stats) and you can always sell it.