LEDs for a SNES

Im currently the proccess of doing a custom paint job for a SNES. Its being made to premote a local car club. The plan is to wire LED Ribbons on the inside to glow a cool purple out of the created vents. The question is, can I wire the 12VDC LEDs into the power switch when the SNES has a 10VDC input and is eventually drop down to 5 VDC VCC. Will i have enough power if i wire it into the switch before the regulator drops the voltage? Thanks for all your help. I'll attach a link to a SNES schematic.
https://wiki.superfamicom.org/snes/files/snes_schematic_color.pdf
 
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