Bangladeshi-American Poet-Editor Hassanal Abdullah invented the Swatantra Sonnet as a form in Bengali. Since then he has been experimenting with the form in English. Hassanal Abdullah is editor of Shabdaguchha magazine, a journal of bilingual poetry (you might like to take a look here).
Compose a Swatantra Sonnet! Instructions can be found here.
A published example of a Swatantra Sonnet in English by Hassanal Abdullah can be found here in Poetrybay online magazine.
My published example of a 'Swatantra Sonnet-inspired poem': 'Vagrant Emperor' [13/2010] appears in Cornwall - an anthology of poetry and photographs (2012, compiled by Les Merton, photography by Angelicia) ISBN 978-1-906845-38-4. Les Merton is editor at Palores Publications and editor of Poetry Cornwall/Bardhonyeth Kernow.