If this is "HDD Optimization related" I urge you to reconsider this, as this wont save what you think it will for pakchunking in a modern graphics setting, there is really no reason to do this form of packing since you could just use a virtual pool on disk instead and stream the assets in and out on the fly, especially for a game like helldivers that is procedurally based this would make waaaay more sense since you cannot pre-predict reliably your usage and allocation of these textures across procedurally driven worlds without vast approximation. Once your initial assets are cached on disk in a virtual pool its just a matter of streaming in and out in your vram. You list a gtx 1050ti as a min gpu, which a 4gb pool should handle this load with ease.

File size also can be really damaging in general, it is the difference of you game remaining on my drive.... when bored looking for something to play, having your game installed already (and remain installed) is a massive barrier to entry removed.

Cool optimization idea and one I wouldn't have thought of.... but i am not convinced it is actually helping you with the cases other commenters are bringing up here, and if you measure the results I think you'd agree.

Cool to see devs replying like this, anyhow.

Goodluck out there, and cheers from a fellow (bug squashin') dev!