Advice needed for expansion to Canada and Mexico

I’m currently an FBM seller in the USA. It is my understanding that all I have to do is add the marketplaces and I’m good to go. The price in converted currency will always be based on the current price in the US.

My first issue is how to add shipping costs. Shipping is built in to my price so it appears as free shipping. I can add the shipping upcharge in the international shipping templates, but then it would no longer be free shipping. Is there a way to include the extra shipping in the base price without interfering with the automatic currency conversions?

The second issue is Spanish translations for Mexico. I have a niche product that doesn’t translate well with auto-translations. Is there a way to provide my own translations without losing the automatic currency conversions?

The last issue is caused by current events. Understandably, anti-US sentiment is spilling over to purchasing habits. I’d like to add a statement about hating Shitler’s hard turn towards fascism. (I’ll phrase it less offensively). I couldn’t find any in Seller Central, but does anyone know of any Amazon rules against politicizing listings? Of course, I also have to worry about the automatic currency conversion issue.