Pretty cool idea, start with Accor and then get matched with Best Western and IHG Rewards. If you do after October 1, then you get it all the way through 2013
Some of these promotions may require you to be an elite member with IHG Rewards Club. You can always get Platinum Le Club Accorhotels status (follow my instructions here) and then do a status match with Best Western Rewards that you can in turn use to IHG Rewards Club Platinum match (read more about IHG Rewards Club status match here). Note that status matches done on/after October 1, 2013, are valid until December 31, 2014 (read more here). from IHG Rewards Club Fall 2013 Promotion Guide | LoyaltyLobby