Srimate Rammanujaye Namaha,

Swamy i also have this doubt. 

Just to add to your question, there is one naamam in Govinda Naamavali “Bilva Patrarchita Govinda”..not sure if it is an exception for Sri Venkateshwara Swamy alone.

For Mahalakshmi they do vilva archanai commonly i think so.

Lets hear from swamy.

Adiyen

Thirukachidaasanudasan.