I'm not a big advocate of stealth :) I prefer not to be but it's not an option unfortunately in this case.
If you are starting up a company that might be in direct conflict with your regular company you will need to set up a corporation let's say in Hong Kong so there is no likely tie to you. But outside that for a moment I like to start up companies on a shoestring or at least test out the concept on real people which a have a couple of methods of doing that. Investors will fight over a proven concept but on just speculation you have to fight to find them. If you need help testing out your idea I can help, thanks...Ken Queen