Your example and illustrations are of course rather curious. They are unknown to the early 19th c. Newari Vess too (as reproduced by the late Siegfried Lienhard).
However, even for (older) Pali only, the weighing of woman is not unknown. In the Therīgāthā (v. 153), the nun Anopamā (‘Unsurpassed’), daughter of a wealthy merchant, is courted by princes and proposed by merchants for eight times her weight (Masset 2005: 52, ‘huit fois l’équivalent en or et pierres précieuses!’; and the cty as transl. by Pruitt 1998: 179–180, ‘what she weighs as measured by those who know marks’). For a context, see my "Karma accounts: supplementary thoughts on Theravāda, Madhyamaka, theosophy, and Protestant Buddhism, Religion, 43:4, 487-498, with an addendum
As far as I know, the best recent work on the tūlāpuruṣa belongs to Annette Schmiedchen:
2003. “Die Tūlāpuruṣa-Zeremonie: Das rituelle Aufwiegen des Herrschers gegen
Gold.” Beiträge des Südasien-Instituts der Humboldt-Universität zu Berlin 12: 21–49.
and
2006. The Ceremony of Tūlāpuruṣa: The Puranic Concept and the Epigraphical
Evidence. In Script and Image. Papers on Art and Epigraphy, eds. Adalbert J. Gail, Gerd J. R. Mevissen,
Richard Salomon, Proceedings of the 12th World Sanskrit Conference 11.1, New Delhi: Motilal
Banarsidass, 145–184.