Hopefully, the recent LEDs will be brighter than the ones we all tested 2 years ago: they were disappointing for brightness.
you might wish to look up the taillight fixtures for the 1970-1976 Suzuki street bikes (GT750, GT550, GT380, etc.), They are so similar in shape to the Honda ones that they almost bolt on, and have 2 tail bulbs in each unit. I always thought this was a smart idea then, and with LEDs it might be an even better idea today!