If I understand you correctly, the FOB (without the blade) works all of the remote functions properly? If that is the case, then all you need is a blade to fit the FOB? Keys in the post will make just the blade that
should fit your FOB. I worked with them via pics/email and they were very helpful.
https://keysinthepost.com/product/porsche-key-blade/
You could try to remove the head, from the valet key, and see if it has the same profile. Then put that in into your FOB?