Originally Posted by Lux Flyer

Cobranded cards (500 PQPs per 12k spending, different limits depending on the card) and upgrading a flight, either as a refare to a higher booking code, or purchasing E+ seats or a premium cabin upgrade will also get you PQPs.

Since your not yet Gold, E+ subscription would also earn PQPs, however kind of defeats the purpose of buying the subscription if it's immediately going to become complimentary when you get the PQPs for Gold.