I don't think one will be developed anytime soon. I currently have 2x and am considering buying a Raynox 250. I am very curious about what results I will be able to achieve!
I should call it DYM - Do it Myself!!! It is similar to Cygnustech, but not so perfect, of course. I bought some plastic black and matt white maps from the local bookstore and a silver self-adhesive folio and velcro tape. The materials I used cost about 10 euros and several hours of drawing, cutting, and creating a paper prototype. When not mounted it is flat, slightly larger than A4, and fits perfectly in the backpack in the laptop compartment. It takes me about 2 minutes to mount it on the flash. The photo of the pelargonium was taken at home, next weeks I will test it in nature. I hope for good results.
https://www.catalogueoflife.org/data/browse?taxonKey=68CK
https://gauchazh.clicrbs.com.br/tecnologia/noticia/2018/05/museu-da-pucrs-cria-votacao-para-batizar-nova-especie-de-aranha-cjhapi26505ts01pa15dmbcis.html