So again- you’re focused on schools you’re not going to get into - should I ED Amherst or Brown - and you’re unable or unwilling to apply to the schools that might have you hope.
If it’s a reasonable fee and then a per school small charge to do WES and only you can decide if it’s worth the investment - but it’d be your best odds.
It very well may be money wasted - but it’s your best chance.
Also, some may take a few days to respond - and some you may have to call.