Have anyone implemented a BRM subscription arquitecture without a Plan Structure?

Here a breaf situation description:

BATCH RATING MODE: Using Alias List

INTEGRATION: CRM-AIA-BRM

BRM SERVICES: /service/telco/gsm/<telephony/sms>     /service/telco/gprs

ACCOUNT SCHEMA:

          One Account

                    One Billinfo

                            One BalanceGroup

                                   N Services (All of them using the same ALIAS_LIST)

After Reading BRM Documentation, got the Subscription Concept, BUT it says a subscription comes with a PLAN, since we are using CRM, there is no chance to use BRM PLANS, so is there any chance to handle subscription (BRM CONCEPT) without PLANS?

The BRM Subscription Concept is really convenience, since we could have many ALIAS_LISTs (groups of services using the same alias) each group (subscription) could point to a single Balance Group, allowing to hand N-Play offers and so on.