The old "Break-In Method" argument is one I'm not going to get into. Bottom line is...your dollar, your choice.
Every major motor manufacturer, from every nation on every continent, recommends gentle break ins. I don't think they have a worldwide conspiracy.
Your money, your choice. The reality is, most of these machines won't see more than 20,000 miles over their lives, so it may not matter much...but do you want to have the choice of using it more, and longer, or see it burning oil or sidelined with bearing failure, at that point?
My take: Machinery is not muscle. You want to grow muscle, you use muscle. No pain, no gain.
Machinery is material. Material wears. New material has to mate to rolling/sliding surfaces.
Just my take, FWIW. Were I in that situation, I'd haul it home in a truck.