I'd say it's probably pretty difficult. I'm certainly not an expert, but to come in to the US on an Investment Visa, I think you need a few million in the bank..

To do it as a Employee, they'd need to do H1B (which I don't think applies here), or standard immigration.. If it's a standard work-visa, there's a problem in that you're not working for anyone..

It probably isn't impossible, but it'd make things substantially more difficult.