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For what it may be worth, most the Kindle for Whatever releases only download as one file extension regardless of the actual format. K4PC downloads as azw and depends on introspecting the file to see if it is mobi, azw3 or KFX. K4Android downloads as prc, etc. calibre is not converting the file when it is being imported but rather changing the file extension to match the file's internals.
If you are using a recent K4PC, it's likely to be downloading mostly KFX files so you would need the newer DeDRM and the KFXInput plugins. Easy way to tell if it is a .KFX is to look at the directory the ebook was downloaded in. If you see an amzn1.drm-voucher.v1.<...>.voucher file, it is a KFX.
If calibre is importing the files as .azw3, you could try using the KindleUnpack plugin to extract an ebup or unpack the entire file.
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