QP_PREQ_PUB.PRICE_REQUEST API and associated Qualifiers

In our system we have defined a modifier for a certain item and have a qualifier based on customer number.Requirement is to extract modified price for this partcular item for customers without creating an order line for an outbound system.Below is the piece of code which is working fine, but here i am populating all the qualifier applicable(in below code this is just customer) for this modifier but is there any other better way to populate "p_qual_tbl" which can be dynamic so that in future a new qualifier like line_type has been added then same piece of code will work