How can I get monsters to pick up and use attack wands?

Intelligent monsters in NetHack will typically use any carried attack wands instead of their melee attacks, even if the wand is weak and their melee attack is instadeath. Is there a good way to exploit this behavior by giving extremely dangerous monsters spare wands of magic missile?

Throwing the wand doesn't seem to work, as they just ignore the item that's now on their square. Dropping it on the floor and walking away sometimes works, but not other times, and I don't know what affects this. I also don't know if they would ever seek out wands on the floor, or if I have to get lucky with their natural movement and hope they walk over the item while chasing me.

I'm mostly asking about the endgame riders, if there's any special behavior involving them. The Wizard of Yendor would also be a good candidate, but I think his covetous nature would make giving him a wand too difficult. I'm also not positive it takes priority over spellcasting, which is the real danger for him.