More crossovers I shall not write
Dark Tower/Sharing Knife: While admittedly they're both in a sorta post-apocalypse America, King's Dark Tower is way more myth-oriented and Meta than the Sharing Knife and Bujold's characters as a whole tend to be a damned sight more sensible than the average King character.
No matter how amusing it might be to make Roland turn out to be Dag's g-g-g-g-g-great grandfather.
No matter how amusing it might be to make Roland turn out to be Dag's g-g-g-g-g-great grandfather.