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so I want to point out if you rename the file.kfx format extension to file.azw8 extension it seems to be able to load it the file kfx in Kindle Previewer 3 if it thinks its an azw8 file.
also I was playing with converting files to kepub format then to LRF format removed a few fonts in under styling tab I used a few of the filter style information which can remove fonts , padding etc..
in any case then I converted from LRF back to azw3 and also tried epub then to kfx format, that seems to work too if you play around with it to get it to convert to kfx without errors but you do have to play around with the settings in convert tab in calibre a bit, I hope that helps, since at one point I had fonts in an ebook I didn't want so I removed them, also I think converting to LRF first helps remove some stuff that can crash the kfx plugin , also used kepub since I was trying the other one that has features like kfx ,
again the only way to load kfx format into Kindle Previewer 3 is to rename the file to azw8 format. I guess it seems that azw8 is like the kfx format since once in kfx and rename it seems kindle previewer likes that file extension for kfx format to be in an azw8 container or at least it thinks that what it is I guess.
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