How to get a comfortable speed display for EUC riding? Smart glasses?

So, i've been learning how to ride on my InM V11Y, which i love and adore.
One thing however which im missing, compared to bike/car/scooter is lack of speed display. I like to know how fast am I going.

Now, obviously, my phone could tell me that, but i'm not going to ride around with a phone in my head next to my face. I tried, gave up after 5 seconds, bad-bad idea.

Any ideas how to solve this? Did someone try smart glasses for this? Do you have other solutions, ideas?