A couple of alternatives are:

1) more reliance on systems to track reputation across projects. I'm sure Microsoft, in the form of GitHub, will love to sell you a partial fix to the same problems it so enthusiastically helped to create. But there are the familiar problems of surveillance, identity theft, office politics, and system-gaming, and it doesn't on its own offer an onramp for new players.

2) in-person coding tests at the same Pearson test centres where people take most of their Cisco (and accounting, and ...) exams today. Not as expensive or inconvenient as you might think, but not the cheapest and easiest, and it certainly has the same concerns re. surveillance and identity theft