Yes

I have a crypto::key_image, but I need to get it into a ge_p2 instead of a ge_p3. What is the proper way to do this?

(using ge_frombytes_vartime)

SO instead of ge_p3 tmp3; hash_to_ec(*pubs[i], tmp3); ge_scalarmult(&tmp2, &k, &tmp3);

I need a conversion from key_image into ge_p2 so I can use ge_tobytes(buffer, &<ge_p2 type>)

Should I just use ge_p3_to_p2?