I remember about Early Lunar Access: a 25 tonnes LEV + a 25 tonnes Centaur upper stage.

It's hard for me to believe multiplying the number of launches, rendez-vous in space (and dockings) which will require time (which will reduce the amount of LH2 through small leaks before it's used) will be a better solution than relying on very few heavy launches going straight to the Moon like FLO.
FLO's merit is that everything lands on the Moon, nothing is in moon orbit, meaning they can land wherever they want (no launch window constraints) and liftoff back for Earth anytime they want.
Yes, it's a new rocket, of course. But one day, if there's any expansion of manned spaceflight, the launch capacities will have to increase.

Raoul