I wrote a piece like that a few years ago, called "The Viridian Dagger", for some contest at the Necromancer Games forum. No idea if I still have it, though. The idea itself works, though a tie to WL is likely going to bring in concepts that supersede BM lore; the Viridians are the "World Emperors", after all.
Back when I was running The War of the Thieves, I pondered introducing the elusive Prince Justini, a WL NPC, to the campaign, as a husband prospect for Tolleen, if Mant wouldn't make it. I decided against it after reviewing the material, because it would have driven the PBP into a completely different direction.
Overall, joining the two settings together can be rewarding, but I think one would need a long introductory period in a game to bring in all the changes. I might pick up the idea in Reprise, though - if, as the LFC assumes, the present of our BM and the present of WL are the same, then, the future of the settings might be interesting in that respect: If the line of the World Emperors dies, then that will shake up the Viridian ecology all over the planet.
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