Used CBs generally go for a pretty good price..... could pay for all the rear lights you want.
But really, if you want to keep it, I have read it can be changed around in it's mounting under the trunk, believe it was sideways and the std tail light lens will fit. Others have posted about doing so in the past.
To me it just made sense to add a light where one was deigned to go (with OE parts available) with a knockout already in place. Mine with an 1157 bulb only is definitely brighter than my smaller trunk lights.
And BTW, just because a bulb is not burned out, doesn't mean it is as bright as it should be. Changing out the trunk bulbs for new is probably a good idea.... mine are 14 years old too.
Here are the led arrays for the OE tail light, if you want to go that way.
I would not hook up the integrated signals in this array.
http://stores.motolume.com/-strse-207/Motorcycle%2C-Ducati%2C-Kawasaki%2C-Honda%2C/Detail.bok?category=Honda+Tail+Lights%3AValkyrieThis one is better and brighter with more leds (no integrated signals). I cannot make this link work, go to tail lights under Categories on the left and click, scroll down to the one for valk.
http://www.radiantz.com/index1.html?c14.html&1You have to do a little cutting to the OE lens which holds the arrays in place.