America needs to keep attracting the world's best and brightest, but linking it to a specific employer is problematic. Opens up employees to mistreatment.
I'd say charge a straight up fee, 500k upon approval. That gets you 5 years, if your wiz making 400k a year it's a great deal.
There is already a work visa for that called EB5 even though the requirement is $1M (800K for rural areas) and you will need to hire 10 American workers. Plenty of rich people from other countries are using that already.
I like working at early stage startups— works pretty well with H1B but it makes the process of getting a green card via work complicated. Some people can deal with all that stress, I just rather not.
Unless their business generates way more than $500k, in which case they'd probably be moving as businessmen, not as skilled workers.