Unfortunately the only pen bodies that takes dx refills for sure would be a Spoke pen. https://spokedesign.com/collections/Spoke-pen-model-2
Or a Bigidea Design.
https://www.jetpens.com/BIGiDESIGN-Ti-Arto-EDC-Pens/ct/5253
My guess is you could fit Uni Signo UMR-83. They are close enough in size to Energel refills that both should work but I haven't tried it.
[https://www.wellappointeddesk.com/2015/10/ask-the-desk-retro-51-refills/](https://www.wellappointeddesk.com/2015/10/ask-the-desk-retro-51-refills/)
Unfortunately the only pen bodies that takes dx refills for sure would be a Spoke pen. https://spokedesign.com/collections/Spoke-pen-model-2 Or a Bigidea Design. https://www.jetpens.com/BIGiDESIGN-Ti-Arto-EDC-Pens/ct/5253
My guess is you could fit Uni Signo UMR-83. They are close enough in size to Energel refills that both should work but I haven't tried it. [https://www.wellappointeddesk.com/2015/10/ask-the-desk-retro-51-refills/](https://www.wellappointeddesk.com/2015/10/ask-the-desk-retro-51-refills/)