I think the language barrier at purchase will be the least of your barriers in a trip through Europe, Asia and Africa. I have purchased several vehicles in Germany and my German is horrible. If they want your money they will find a way to sell you anything you want.
I would focus more on visas, international drivers licenses, insurance, road side insurance, medical insurance, security threats, provisions, equipment, and communications.
Lemmings as you know them are a Disney fabricated lie. The truth is out there.