Hi Vince,
Awesome work. Perhaps you should consider laser cutting premium replacement cases for onyx devices themselves, low profile edges round the screen, brushed aluminium, gold plated buttons etc.

Good luck with your enterprise, I hope the take-up is good.
What mapping software do you use with your reader? I noticed in your videos that you have to press the buttons to pan the map which does not seem very safe.
I don't own a motorbike, but your idea made me think about using eink on my pushbike. Unfortunately
Onyx E43 looks like a failed attempt,
YotaPhone is too premium and has the unnecessary regular second screen, could
InkCase be the answer? Available from October apparently.