Some ideas you may have had, others you may have not.
Here are a few of my solutions
Your simple 3-step solution.
Step 1. Crystal Clear Gorilla Tape. Use it like a laminate over the LEDs. All of it.
Step 2: If your PEV has a USB plug then.... lucky you!
For those like me who don't, this is what I've learned. You cannot mount a power source to an e-board. I mean you can try but you're better off body mounting the power source and running a USB extension to the LED inlet source firmly mounted and molded into a safe place on your deck. It may get ripped out if you separate from your board, so careful doing it this way.
Step 3. Look very cool with colours under your ride.
Most accidents occur with PEVs when a vehicle does not see/hear the approaching e-rider. Wear anything reflective or bright. Anything but dark colours.
Building up your gear isn't easy or cheap. Simplify it by picking up gear with built-in padding. Something is better than nothing so do with what you've got!
There are Jackets for the cold, Hoodies for the moderate days & light armour for the hot days.
You can get Pants with built in knee protection & hip protection. Personally, having pants with space for optional knee padding is key. I trust my dual axis pads too much. Motocross pants with a little hip padding do this perfectly. Never underestimate hip protection.
Trust in any high top shoe that covers your ankle. That is a simple built-in padding hack.
Style of built-in padding in my Hoodie from Longboard Living Toronto
Have something other than your voice to alert drivers. I sell a sufficiently loud horn for this reason but anything that is loud will do. Bike horns are fine as well, anything that someone inside a car can hear you with.
This tip will help boost your visibility and confidence on the road at night.
Get a front facing white light and a back facing red light.
Doesn't matter how good the lights are because they are not for you, they are for others to see you.
Get an alternative headlight for your field of view and ensure you can direct it out of the eyes of oncoming riders/drivers. For this I personally use a very strong helmet mounted bike light.