Marrying Vina to Rico - what else do I need to look out for?

Going for a Stratocracy/Pro-Su Omina run this time around. I plan on purging House Sazon and uniting Toras & Azaro.

Vina & Rico can bond over Bruno's injury but what else can I do to make the marriage work, and help Rico succeed as Duke of Iza? I'm already pro-Su Omina and I'm going to arm them to take back Zille.

My biggest concern is Vina, I don't want her to run away. She's bonded with Rico over Bruno, I've let her into royal council meetings and let her dance with Manus Sazon. But I plan on "disappearing" Manus with the Golden Guard later on, which Vina always catches onto.

I don't think it's possible for Vina to actually **love** Rico or vice versa, it's a purely political marriage. Toras & Azaro combined with Sazon couped and Reinhart crushed.