With it now about $10 cheaper compared to Nintendo's US retail price + sales tax, I decided I'm just going to keep this Japanese order no matter what, even if it comes a few days after launch.
So there. I officially just paid $64.54 including shipping for my Pro Controller. (Thank you Capital One for not charging 3% foreign transaction fees, or whatever percent other credit cards charge)
I just ordered an Amazon.co.jp custom e-gift card for the exact yen of my order (my order total was now 7,420 yen) and had it emailed to myself. After I got it I applied it to my account, and then applied it to my previous pre-order.
https://www.amazon.co.jp/dp/B004N3APGO/
I had to pay for it upfront. But now I don't have to worry about my card denying the charge before it ships out. And also my exchange rate is now locked in. So I also don't have to worry about the exchange rate changing in favor of the yen by March. If the yen drops by March I'll have made the wrong gamble, but oh well. $64 for the Pro Controller, I'm happy with that.