Thanks for all the responses, and too bad it cannot be done, I wanted it for 3 reasons:

1. There is only 1 seat left at the lower fare
2. I want the H fare as gold (instant upgrade) but second Pax on the lower fare
3. I was contemplating using the companion cert as well but not necessarily

I understand I can do 2 PNRs and call and have the upgrade done manually, but we are all aware of how 2 linked PNRs are not the same as 1 PNR for various reasons.