It’s interesting to hear the longer guards are ineffective. My plan at the moment is to develop a strip of Carbon that bridges the gap between the rear plate holder and the hugger just by the battery. What I want to do is keep the cut out pattern of the original guards, to keep with the bikes current style but I’m not sure how effective it will be with the cutouts, so I’m planning a fibreglass one first.
I’ll probably not get around to this for a while, I have other more important projects first, but I’ll let you know how it goes when I get around to it.
If in the meantime you do something with alloy guards let me know, I could be swayed down that path if it looks the job.