Nothing easy. Technically the Stripe “plans” only offer $0 trials (basically pushing back the initial subscription payment by X days). PMPro is setup to create one “plan” at checkout and keep that plan going.
You could setup a system where users get one plan at checkout with one recurring price and then at a later date (after the trial) swap that plan out with another one. Stripe will let you do this without getting the CC again, but PMPro isn’t setup to facilitate this.
I haven’t had the chance to build this yet. It is something that we could setup under the “Do it for me” plan on our website.
https://www.paidmembershipspro.com/pricing/