I print on metallic vinyl all of the time. I use silver, there's no reason to use gold or any other color. If you need a gold color just print it. I use either Oracal 951 M Silver Lake or 3M 180mC Satin Aluminum. Neither of these is advertised as being printable but it's vinyl so with ecco-solvent, what I have, it prints just fine and, by extension, should work equally well with full solvent.. I routinely contour cut both flavors. I use 3M when I have to do a full bleed, I've never had it lift on the edges. I use the Oracal vinyl when I don't do a full bleed although I don't know if it will lift along the edges of a full bleed or not, I've never tried it. It'll probably work as well as the 3M, maybe someday I'll try it. I've been doing this for years and never, as in ever, have had a problem with either vinyl.
The only challenge is contour cutting. My cutting tackle, an ancient Graphtec FC7000, has a hard time reading the registration marks on either vinyl. Your mileage may vary. Back when I was wrangling Flexi I'd just use 4 point manual marks but the software I'm using now [long story] doesn't work so well with manual marks. That being the case, I'm forced to provide my own home made registration marks on the print, register the leading edge of the vinyl at some geographical point on the printer, print just the registration marks, place a white vinyl patch over each of the marks, back the media up in the print so that it's once again registered at exactly the same place as before, and finally print the entire image including registration marks. If you did it right the registration marks in the actual print will land right on the white vinyl patches. I use Oracal 751 for the patches. Not 3751, just plain old smell my butt 751. Most any white vinyl will work.