The F/M/C instead of a C/M is an interesting idea. I'd be a little worried about excessive XP splitting between classes, particularly for a character with major healing duties. Anybody care to discuss the detailed positives and negatives of having two triple-classes in the party? I rarely have even one.
A F/M/C would still be limited by the cleric's weapon restrictions. The question I have to ask myself is, do I need 6 warrior classes?