while i really do understand the desire to not cede the term to TERFs, i really do think at this point that the term "radical feminism" is unsalvageable for transfeminism.
you can argue about the origins of the term all you want, and that history is important to be aware of, but fundamentally in this day and age most trans women who hear about a "radfem" are going to be understandably cagey, and appeals to history are not going to effectively shake that belief!
quite the contrary, labeling your politics "radical feminist" is likely to drive away many transfeminists who otherwise would have been very open to coalition building, especially when the modern crop of such self-identified "transradfems" are mostly known for palling around with detransitioners and writing horrific ableist screeds.
it's a correct approach to try to not reinvent the wheel and learn from our feminist forebears even in their failings, but drawing the line in the sand around the term "radical feminism" is worse than useless when, to most transfeminists, it makes you sound like an autistic advocate trying to name their improvement to autistic lives ABA to "reclaim" it from conversion therapy.
it's bad propaganda and it's bad coalition building, and will only make the transfeminist politic more fragmented if you keep prescribing a new definition to a term that, objectively, most of the trans women you're trying to reach associate with their worst oppressors.