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Yupp the Nivo is a pain at the script level. Almost not worth the effort.
Certainly not an on the fly setup. Changing pics is like you say difficult.

Faulty Voltage regulator would be my first guess.
My second guess is the plug on the regulator is loose.
My third guess is the regulator is not grounded good.
My fourth guess is the bracket the regulator is loose or not making good ground contact.

Replace the fuel filter. It lets trash through and causes the problem.
Mine did it all the time, Replaced the fuel filter and no more leaky leaky.

Here is my experience with Headlights on scooters.

I had an original Tomas 50cc 2 stroke moped. It had no battery. It had a 35watt headlight. I added a 35/35 watt car sealed beam to the front. It worked great. I ducked taped it on. I got the lamp at Advanced Auto.
this scooter/moped soon reached it's "end of service life" and was retired.

Some time later I got a 50cc China scoot from a pawn shop. $235. I pushed it home. After redoing the belt/variator setup I ran this thing 12000 miles. Along the way I put the 35/35 watt headlight on it from the Tomas. It was OK. I still wanted more light.

I decided to put a 55/65 watt 6x7" car headlight on the scoot. I got the power from the tail light. I used a LED tail light . This freed up some power to make the 55/65 watt work.
This worked fine because I wasn't running a battery.

I was getting 55 watts at idle and 65 watts up off idle.

This headlamp mounted to the front of the scooter looked Mad Max. Everyone seemed to like it. Cops even liked it. It was my trade mark.

Ok so the time came to make a decision. The scoot had reached the end of it's service life. I was going to scrap it and get a New one from Italy.

Then I realized a New Scooter isn't any fun cause you cant mess with it. I would wreck the value of such a fine machine bu moding it. So I looked at the old china scoot and said it is time you gave something back. Research Baby. Your a Guinea Pig now.

So off with the engine and on with 80ccBBK+ new crank+ all the Jazz.

Off with the headlight and On with an HID.

The HID project was involved. It included a Stator Mod, a new regulator, a rewire of the basic feed points to the battery. And testing.
It also involved a fabrication of the headlight assembly. A new lens setup and fitting the new lamp into lens assembly and setting focal point. Setting beam pattern. Gluing it all together. And more testing.

The project has advanced to this stage:

stator rewire to full wave. (completed)
Add fullwave regulator/rectifier (complete)
rewire basic circuits for all DC electrics. (complete)
Fabricate Headlight lens, reflector HID assembly. (complete)

Testing Phase.
observations.
1. the light is extremely bright. It is brighter than expected. It is so bright I decided to add a daytime Headlight 30 watt halogen so not to have to use HID when not necessary.

There is also a High Voltage aspect. I don't run it wet. If it is raining I don't run it. 18000 volts dancing around can be a problem.

This setup seems to wear on the battery. To soon to tell but I suspect the battery life is shortened by alot. Still testing.

There doesn't seem to be interference to the gps unit. ( from the high voltage) (high speed switching power supply) The gps works fine mounted 4" from the lamp.

Testing is still ongoing and what I like so much is on back roads, country back roads all black this thing lights the night up. It is so amazing to see the night turn into day.

Special consider needed to be made to not blind on comers. I have found a glass store front works good for testing. Point the light at the windows and get a reflection. The Glare test. Using foil tape to mask our certain areas of the lens that cause glare.

There seems to be a lot of country boys with 4x4 trucks going to HID on stock lenses. These thing are Blinding. They are quite a few now.

The are called spider gears.
It puts the "Diff" in Differential.

468-480 ohms on the ign coil on the stator is what I read on 2 different stators.