Auto-Renewable subscription introductory + promo at the same time

Hello,
We are trying to implement the following subscription plan for auto-renewable annual subscription:
7 days free trial, then reduced price for one year, say $9.99/year, then after the first year (on a first renewal) the price should be increased to the regular price, say $19.99.

As it is stated in the documentation, only one introduction price is available, so we can go either with free trial or with reduced price ("Pay as you go", I believe). But what about having an introductory price and promo at the same time?

Is it possible to somehow get the flow mentioned above?
Auto-Renewable subscription introductory + promo at the same time
 
 
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