If you have an iPhone, just change your phone region to Japan, and use wallet app to add Suica card to your apple wallet. You can charge whatever amount to your Suica card using Apple pay and it's good to go.
There’s no need to change any region; just open Wallet, press the + sign in upper right corner, scroll down to transit cards, and scroll down to Japan section to find Suica as well as PASMO and ICOCA.