Hi KFF, I have never seen the Yee Jee Kim Yeung Ma in the White Crane systems that I have experienced. Most seem to use Sei Ping Ma, however in the system that I practice, the Sam Chien stance has a similar feel to the Yee Jee Kim Yeung Ma.
What if you were to take the "White Crane" Weng Chun San Chin (tri-post) type horse and pull one back so that they are even? Then, add in the Rou component from Emei Snake! What do you have:
Character "=" Clamping The Yang Meridian Horse
BTW: Equal (=) does not exclusively refer to the foot positioning but to the distribution of the bodies equilibrium! Natural Zheng Chi horse and wholesome body power!