I knew there would be posts that say you are more focused on the left wrist and that is your option.
HOWEVER
I used to be the same way and i tell you what it really was a lot harder to learn how to keep the left wrist flat. If you give it some time and just learn the relationship to keep the right wrist bent back you'll be better off in the future.
Now do i focus on keeping my bent right wrist frozen through impact? HELL NO, thats too hard for me. Its easier for me to focus and feel for that solid left wrist through impact like many of you.
BUT
It certainly is easier to get that left wrist flat in the takeawawy and top/end position by just bending your right wrist rather than flattening your left. I've been there and done that and i truly believe more people would learn the flat left wrist imperative better this way because it has been my experience with myself and those i help that when you try and keep the left flat you at times sneak in a cocked right wrist action..