I think that to pull this off you need to do a lot more diplomatically to first get them to the point where they will consider it (white not red) and beyond that to do it for an acceptable price.
To get Napoleon to attack his pal Ghengis I first sent missionaries, but the convert option was still red. After a while, with most of his cities infected, he converted on his own. With relations improving, more options opened up. Then he offered war for 3 new techs. I gave him a resource and some cash and waited. After a while he'd do it for two techs.
To get Napoleon to attack his pal Ghengis I first sent missionaries, but the convert option was still red. After a while, with most of his cities infected, he converted on his own. With relations improving, more options opened up. Then he offered war for 3 new techs. I gave him a resource and some cash and waited. After a while he'd do it for two techs.
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