Wouldn't laena be better for him as she has vhagar and corlys is richer than lannisters and rhaenys is more likely to support him as his children will be trueborn
Give him all attributes and a demon spirit which can eat the physical as well as other abilities of other demon beast of whose spirit it eats and perhaps make him a half demon half god and half human
You can even lengthen the story by making his loose against sage emperor once then comeback again in 2nd timeline and defeat perhaps due to his relation with ying yueru nei li may keep him in reverence for being his husband or hate him for the same