One Button Macro that will switch you from Stance of the Spirited Crane/Stance of the Wise Serpent on a 1 second CD.
With Macro Icon being the "?" at the very top of the list and Macro name being "X" which is whatever you decide to name it:
/cast Stance of the Wise Serpent
/cast Stance of the Spirited Crane
/script m_ws=GetSpellInfo(115070); m_sc=GetSpellInfo(154436)
/run SetMacroSpell("X", GetSpellInfo(m_ws) or GetSpellInfo(m_sc))