The ornamental design for a wheel cover spoke assembly, as shown and described.
FIG. 1 is a top plan view of a wheel cover spoke assembly showing my new design;
FIG. 2 is a sectional view thereof, taken along the line 2--2 of FIG. 1; and,
FIG. 3 is a front elevational view thereof.
The side and rear elevational views are identical to the front elevational view; the bottom is plain and unornamented and the portions of the wheel cover as well as the attachment between the wheel cover spoke assembly and the wheel cover shown in dashed lines do not form part of the claimed design.