Who said anything about getting a visa? The entire point of my idea was about skipping German bureaucracy. The only US bureaucracy is the IRS, and 2 forms for offshore LLCs at that. Getting a visa actually defeats the purpose of the Wyoming LLC, since you'd have to pay federal taxes as a US resident. But with the Wyoming LLC being pass-through with the added benefit of zero liability (same arrangement as OP), you'd only have to pay corporate taxes and then German personal income taxes as a German resident. You don't need to step foot in the US at all.
You can't get a visa to run your own company under normal circumstances anyways, the only routes being O1, EB5 or EB1.
O1, EB5 or EB1 are visas, sure EBs are also referred to as "green cards" but they are visas. And you are also missing the E-2 category.
The US has dedicated visas for running your own company in normal circumstances. I am not sure what you mean.
You mean German CIT and German PIT I assume. How happy would the US IRS be with that?