Permanent Lezyne 800+ mount?

I have a Brompton electric with a 31.8mm bar and stem.

I use the integrated lights, but also a lezyne 800+ for additional flood or flashing mode in town.

I’d love to have a more permanent mount, what’s the slickest way of doing this?

I can do it on the bar or the stem plate, I don’t mind. I have seen some stuff on the lezyne website, but as you can see the angle of the plate is 90° from where it is usually on a typical bike.

Thanks for any help.