They have to come past, you can start the car and pivot, you're also getting them BEFORE they get near the place, thinning the numbers that much more, AND you can drive away as they go for cover, assuming you don't get them all, but ... y'know what? this is like the old days trying to talk sense to ENTERPRISE fans. If you can't see that every bit of 'strategy' in this is horseshit, then revel in your POV.
And losing every element of surprise that Bond desperately needs to overcome a larger, more heavily armed force. Driving the car around a field in Scotland trying to run down mercenaries is absurdly stupid... dare I say, "horseshit."