Let me know if you find one! I'm at a loss. (And even then, if I switch I have to pay $$$ taxes on capital gains)

You can sidestep this entirely with a total-market fund like VTSAX/VTI, which hold the entire market and should be more resistant to being gamed.

They’re free-float adjusted so entities like SpaceX are valued only by what’s available on public markets. And Vanguard (and its funds) are owned by its investors, which makes it seem implausible that the rules would be rewritten in a way that would damage investors.

Any of the direct indexing providers will let you blacklist individual stocks from the index. The intended use is to exclude stocks you hold elsewhere (or receive as stock grants) to avoid causing wash sales, but it can also be easily used to make a custom "S&P 499".