How about removing the “Shift Fields” filter, so FCP can’t apply it.
It’s located in the Final Cut Pro App bundle…
Control click on the App icon….select “Show Package Contents”
Then look in Resources/English.lproj/FXScripts/Filters/Video
Remove the filter called “Shift Fields.txt” and put it in a safe place (in case you need to put it back)
Sorry, I cannot fully test it, as I do not have any HDV footage, but I can attest that removing it causes no ill effects to FCP.