I really think I might have done it.
Unfortunately the website doesn't have a video of the twinkling but the advert I followed to get there did and they definitely twinkle not flash and its every bulb not just half of them.
Old style looking bulbs (Although they are LEDs) and they do warm white or coloured (including pink! 😁)
I'm going to buy a set and see what they're like
🤞🏼
We R Christmas - vintage candle lights string 600 lights
https://werchristmas.co.uk/products/vintage-candle-light-string-600-leds-warm-white?variant=56668551872892
https://werchristmas.co.uk/products/vintage-candle-light-string-600-leds-multi-colour?variant=56668551840124