There is a findable link on the internet for a direct Accor Club platinum level for new accounts if you are an Amex Plat holder (including U.S.)
edit: -> the link has now expired
Turns out, the registration via link does not actually verify you are an Amex Plat holder.
Which is a ^ or

depending on how you feel as an Amex Plat holder.
Waiting on StarFlyerGold feedback before posting further....