This rite that you have conceived, has been ordained by the SelfCreate himself. Who else save the SelfCreate could ordain this ritual in Shraddhas?
सोऽयं स्वयम्भुविहितो धर्मः संकल्पितस्त्वया। ऋते स्वयम्भुवः कोऽन्यः श्राद्धेयं विधिमाहरेत्॥