I managed to set up my binds, with each of my 4 chars only having 6 macros. My suggestion for anyone else trying this setup, is to use 2 spells per button, both a harm and noharm, you save (in my case, 50%) of your bar space. For example, I have a Chain Lightning/Chain Heal on 1 button, Lightning Bolt/Lesser Healing Wave, and Flame Shock/Healing Wave. It really has made life easier for me, not only switching from a focus-oriented setup, but also adding these to the ftl setup.

edit: not sure if modifiers can still be used with the way I have mine set up, i'm at work, but i'll check when I get back home and let you know.