Some more painting help on Limited Edition HG Kits

1- On 1/144 HG RX-0 Unicorn 03 Phenex (Just the normal plastic, not the recently-released plated model), how can I replicate or create a plated-ish gold color to paint on the Phenex??
Related: on a limited edition HGUC RX-0 Unicorn 02 Banshee Norm Unicorn Mode Metallic Version, to get rid of the gate cuts, is there a way to create a black paint that can nearly replicate the metallic black??

2- Since there will be a future release of the limited edition Pearl Clear 1/144 HGUC RX-0 FA-Unicorn (of course, the Destroy Mode), would it be a good idea to use a Tamiya Acrylic Clear (Clear only) to enhance the white Pearl Clear parts??

1: No for both.

2: The clear paint will only make it glossier. It won’t do anything to the colors.

Just to add to the answer of your very first question, the only way to replicate a plated gold color like on the plated version is to do a candy coat. That consists of spraying a shiny metallic first such as Chrome, then spraying an acrylic clear yellow on top until it’s the desired shade. Then gloss coat.