Change “Choose your background color” palette in Windows 11

In Windows 11 Settings, under Personalization>Background, there is a drop-down titled “Personalize your background”. Within the drop-down (with ‘Solid Color’ selected), there is a palette of default colors under the “Choose your background color” prompt.
Solid color palette

I would like to modify this palette such that it only offers the following colors:
#000000
#ffffff
#ff0000
#00ff00
#0000ff
(That is: White, Black, Red, Green, Blue)

I tried modifying the values specified in this answer – but I see no change after adding my desired values to either AccentPalette or AccentColorMenu (with the 00 padding at the end) and logging out/in.

Is this change possible?