Broadly, there are two challenges: building a company without crossing the line into unauthorized employment and getting authorization to work for a company yo

Broadly, there are two challenges: building a company without crossing the line into unauthorized employment and getting authorization to work for a company you founded/own. Beyond not getting paid, the line mentioned above is a grey and nuanced one; the very general rule of thumb is that its time to get work authorization when the side project is no longer a side project. The work authorization options are the H-4 EAD, as you note, which almost certainly will remain untouched if there's a change in administration, a concurrent part-time H-1B, which would allow you to continue working for your current H-1B employer, the O-1, a high standard but ownership and control are not really issues, and the H-1B, with ownership and control stumbling blocks.