I know this topic is a little old, but
I am one of empress' LSs in Gamma Sigma Sigma and am also a member of Zeta Phi Beta, not to mention a Masonic Order.........
It isn't impossible to do. You just have to be aware that each will require of you contributions on a physical, emotional and financial level.....if you're able to handle that, then you should have no problem at all.
Good luck!
