ABAP instances on a trial account work different. The ABAP instance for a trial account is a shared service and already available in CF environment. That is why you only have to "subscribe" this service, which is shared with other trial accounts. Regarding your question: No, these plans are only available on a productive account. On trial you only have the plan shared. To set up your trial ABAP environment, please use the Booster on global account level.