Importing FBXs from 3dSM without interpolating animation curves

We're trying to speed up our current importing process for a project that requires importing massive amounts of FBXs with included animations. One of the things that increases the import time is that we created a post-processing script to go through all the animation curves and remove the interpolation Unity is including. We do this because otherwise, it causes jumps in the animation that aren't there when the models are exported from 3dSM.

I'm not familiar with the import process for FBX files, but I imagine if it was possible to change the default import options to assign a flat interpolation between frames, it would be faster than importing them with it set to AUTO, then removing them in post-processing. Is this something that is easily changeable, or does it require some deeper digging into Unity's native inner workings?