+1 to T.O.
Pay a lot of money for a broker/importer ...and I don't think you have enough time to do the process unless you already have a good start.
Almost 20 years ago I was in Germany returning to the USA and had a couple vehicles that I wanted to bring. I quickly found that it was not going to be worth the hassle and expense. Regardless of the state registration requirements that were mentioned it has to get through customs before you can even think about state registration. Even bringing my USA origin car back to the states there was a rigorous inspection. I failed the first time at the port in Germany because of a few dog hairs and some dirt in the fender well (US Department of Agriculture requirements).
Reading your post, it sounds like you are familiar with some of the process already. In 2001 with my BMW 1802 and Diesel VW Transporter I remember DOT Safety equipment and EPA emissions were the two big categories. I think that your car will need certification (stickers and paperwork certifying compliance) prior to import.
My experience was through the military, but I think the same facts will apply regardless of you affiliation. Check this page for some info:
https://www.schumachercargo.com/military/importing-pov-us-military-department-of-defense.html
Customs:
https://www.cbp.gov/trade/basic-import-export/importing-car
EPA:
https://www.epa.gov/importing-vehicles-and-engines