PROC MODEL does not have a built in option to do the reweighting; however, you could specify two FIT statements to perform the reweighting yourself:
proc model data=temp;
fit y / outactual out=o;
y = b0+b1*x1+b2*x2;
outvar resid.y;
fit y / data=o;
h.y = resid_y**2;
quit;
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