Whenever I have parted with my hard earned on a vehicle motorized or otherwise, although I have had my colour preferences, I have always let my head rule my heart and purchased based on getting the best for my money that fits my technical requirements and budget the best BUT irrespective of colour.
I have to confess, I'd rather like a bike in British racing green or at the other extreme one coated in a paint that worked like those reflex stripes you find on bike tyre sidewalls to make me glow like a phantom riding in the dark. But ultimately the pleasure comes from riding the bike and not just admiring from a distance. I own (or have owned bike in bronze, hi-viz neon, various shades of grey but none I would have taken as first choice had an alternative for the same money been available at the same time.
Given the difficulty in getting the bike you want quickly- maybe find the bike that fits, has the components you want but that compromises on colour or on other components. When I was looking for my Rohloff equipped bike I wanted a disc brake Rohloff with hub dynamo, mudguards and a decent carrier. Nothing decent came up for a while until a friend convinced me to try Magura rim brakes as alternative. I did, and was impressed how much better than V-Brakes they were. And I bought the bike I now use daily.
The only regret, a week or two later, I spotted a disc braked bike, albeit without mudguards, dynamo or carrier at a similar price to what I paid, but where I might have retrofitted the missing components I wanted had both been available at the same price on same day when looking. But after 13,000km, I have absolutely no regrets in having a bike which checks almost all the boxes important to me- irrespective of colour which 'meh' if anyone is asking
