C isn't magic, plenty of people understand it and lots of these projects move quite slow. That these things CVEs on ssh are so rare shows how well this process normally works. These past couple of weeks have had 3(?) ssh vulnerabilities? We often go years with one, and not all are a result of packaging some come from upstream.

Any new process needs to not just fix this problem, but also all or at least most of the problems that the existing processes fixes.

Tracing thousands of developers across the planet and drafting contracts in hundreds of jurisdictions, including some where you don't even have a branch office or any kind of legal presence? Ugh. And what if one's from an embargoed country? What if a primadonna asks for a million a day, or half of them don't deliver in time, go on holiday, win the lottery, fall in love, get into a dispute, refuse to work with you, don't have access to all the architectures for comprehensive testing, lose interest, change employer (and can't work with you anymore), or sell to some dodgy entity preparing the next sBoM attack.

....better to pay your own people. Hire them if they're available, sure, otherwise task an engineer with this.