i've seen something done on the standard toyota 86 wheels that might work for you (i think it was a wip on this forum?)
the technique involved painting the silver first, You need to use a lacquer at this stage.
Let that completely cure.
then paint the black over the whole wheel, but this coat is water based paint.
therefore you can easily wipe off the high spots and other parts you want silver with a cotton swab / Qtip with water if needed.