There is essentially loans of USD that happen on balance sheets that is paper between institutions outside of USA. So such trading and settlement is possible. But if there is block of actually getting this money in real dollars, that is rather pointless even more monopoly money.

What do you mean real dollars? Dollar deposits in bank accounts outside the US are as real as dollars deposited in US banks.

Oh sweet child, try transferring your “dollars” out of your country first – especially into US – before you claim they are real.

This is absolute nonsense. International trade is predominantly conducted in US dollars, therefore it's patently obvious that it must possible to transfer dollars abroad.