If you want old standards, rim brakes and narrow tyres, you can buy a top-end frame for peanuts because everyone is desperately selling them to buy disc bikes.
You can barely give them away!
Remember Bike Fit doesn't necessarily give you the right answer - so if you can buy the frame used, even unused, you can try again if the result isn't quite what you wanted.
Worth mentioning the geometry/measurements/etc for said top end frames is likely to be floating around online so should easily be able to compare measurements from a fit to those of the frame and see if it's workable, but as above it doesn't always give you the right answer as fit is obviously very personal - I'm 5'10 and feel best on a 55, good friend of mine same height generally prefers 54's but his favourite was a custom Fondriest that was 53.5, guy on YouTube who's entire career is fitting (bikefit james) is also 5'10 and rides a 52!