It wouldnt hurt anything splicing in if your using a relay but that was the simple way, you did it the better way looks like you just advanced in automotive electronics. If i were you id wire a toggle switch to turn the hellas off if you just want the fogs on ,too much light in fog can be bad.
I put the yellow lens shields over the OEM fogs & the Hella lenses. I read somewhere that the yellow lights that became iconic on Mini Cooper rally cars in the 60s is what helped them go on a hot winning streak. Basically they could put killer times down because their yellow fog lights allowed them to keep their speed up when everyone else had to slow down.
The problem w/ lights in fog is all about reflection. We all know (please God let that be true) that bright lights in fog make everything worse. That is bc the higher the intensity of even “white light” eventually begins to lean towards what we perceive as violet/purple. That is at a wavelength between 375-450 (not exact, but close). Violet is the most reflective & the harshest region of the color spectrum. The lower the wavelength, the longer it takes to dissipate. Think “ultra-violet.” That’s why our phones now all have night mode. It essentially turns down the higher wavelength colors so you aren’t kept awake as late playing w/ your phone.
On the opposite end of the spectrum is the least reflective color - red. Red has a wavelength of 625-750. So it travels through space so fast it will barely dilate the pupil. It is really hard to nail down the source of a red light unless it is steady. That is why military/police use red lenses on their lights when they are trying to be low key & w/o fancy night optics. The color red also will not mess up your natural low light vision bc it is so much faster - part of the reason tail lights & brake lights are red.
So the spectrum starting w/ high wavelength low reflectivity is red, orange, yellow, green, blue, & then violet. Amber is probably somewhere in the middle between orange & yellow. “White” would be somewhere between blue & violet. So, in theory, by using my OEM fog lights w/ yellow lenses that are located low on the bumper & are oriented to shine up & away should cut through the fog from the bottom (remember that fog rises). Then by adding the two Hella lights that are also yellow lensed & brighter than the OEM fogs & are centered on the rally bar in front of the grille but w/ a wider range. Fog should not be a problem.
However, should all of this be nonsense & science doesn’t come through for me - I’ll just turn off all the fogs, keep the brights off & let the steering responsive headlight feature do their thing.
Hopefully some of that makes sense.