Traditional Orissa Project:
This video will start at 5 minutes (you can watch all if you wish)- shows how the tradition was feminist, [as well as anti-caste, and anti-racism] since before the 1500s.
Deeper Reading on the Utkal Vaisnava History
The whole book is interesting, and specifically discusses Panchasakha in the last section [1988].
https://www.academia.edu/32939130/Sahajiya_cult_of_Bengal_and_panca-sakha_cult_of_Orissa
The entire preface is great, but pages cxxxvi onwards directly address the Panchasakha [1912].
https://archive.org/details/archaeologicalsu00vasurich/page/n201
Translation of parts of the Odisha Bhagavat Purana (Bhagabata) which was one of the first times a Sacred Brahmana Sanskrit text was translated into the common language to inspire the common people. This was revolutionary in India and started a cultural revolution in Odisha.
https://books.google.com/books/?id=vFq0MMOvQc0C
Article to understand Theology associated with the tradition more deeply:
Caitanya Vaisnava Theology in Context
Buddhism in Orissa
https://www.academia.edu/5916911/Odisha_Cradle_of_Vajrayana_Buddhism