Neutral Belgium might separate troops from logistics

Could Germany persuade Belgium to open a logistics corridor without allowing German divisions to invade?

Possibly, especially if France appeared close to defeat, because Belgium might allow supply trains while still refusing passage to troops.

Belgian policy might change if German success made a French defeat look imminent. Belgium could conceivably permit German logistics trains to pass while continuing to bar combat troops. Supply transit would support the German army without reproducing the same overt violation as an invasion. The scenario depends on Belgium believing that France was close to collapse and that this narrower concession could preserve formal neutrality.