बहुलं छन्दसि 7.1.10 इति च्छन्दसि क्वचिदप्रवृत्तिः। तत्र कर्णेभिः इति रूपं जायते।
Yes. It is used in different 1st class in Vedic usage.
व्यशेम from वि+ अश् (A and P 1) = To reach, attain. First person, singular, optative mood. Meaning of व्यशेम = 'May we attain' (As later in the same hymn पश्येम.)कर्णेभि: = कर्णै:, आर्ष प्रयोग.