I bet you could get creative enough with the law to allow foreigners to work without a proper visa.

I am not a lawyer but I imagine if the team can get a tourist visa for three months, their new company was incorporated off-shore, in Ireland or the British Virgin Islands, and paid them in their home countries in advance for three months work that they could live in the Bay Area and participate fully with the added bonus of lower corporate taxes.

Or everyone could go to jail.