The popular Vanguard ETFs will definitely have it, they do track CRSP and FTSE Russell (VT and VTI for example) - Both of which adopted fast track rules that will allow SpaceX to become eligible 5 days after the IPO. Unless Vanguard themselves decide not to include it in their portfolios (seems unlikely but you never know). I think Vanguard does have some funds specific to tracking S&P but that's not usually what people use Vanguard for.
e.g.
https://moneywise.com/news/top-stories/elon-musk-spacex-ipo-crsp-vti-ftse-russell-nasdaq-401k
That could lead to some interesting outcomes, how these funds look in 12 months could indeed be tied to which specific index(s) they are tracking.
PXE / Net boot / install is a thing but that's not really meant for Linux noobs. Often times it's something IT departments do to install the same OS image on multiple systems on the same network (not just Linux, Windows and others can do this too). I've never attempted to do that over the internet so can't say much else about that process.
Being this is linux4noobs I suspect you're just talking about one system being installed, a regular USB install would be far more feasible in your use case. You're kind of going straight into hard mode attempting more advanced types of installs.