There is a fundamental disagreement in handicap world between stats guys and measurement guys. The measurement guys will argue... If you had perfect data betweeen two fleets... One of them the N17 where the sailors are practicing 200 days a year and the F18 fleet (Yardstick) where the sailors are practicing a whole lot less... this basic asymmetry will skew your stats so that the N17 rating will be too fast. In the real world....for other classes, a rock star sailor competing in a carboard box will beat the top rec sailor on his 5 year old boat. The stats are screwed! The stats guys will say... Hey... you are trying to model a nonlinear performance curve of classes that span 4 generations... No chance in hell!
YMMV.

A VPP application does not give you a ratings table.... it gets you polars to sail to for your design. VPP approaches inform handicapers who create rating sytems like the latest failure (HPR) which lasted for a few years before the owners decided it was not for them. So... no pot of gold at the end of the VPP rainbow.

The Alter cup... is just a one design regatta. No other boats are on the course to compare with. So... it is of no use to the stats based guys or the measurement guys.