I don't personally know how to track kills to add that perk you mentioned, as I have no modding experience, but I know in N7R's ACR-W17 mod kill tracking was used to unlock weapon mods directly and I'd imagine it's a similar process. I don't know if he is still active, bit if you are interested in adding that perk it couldn't hurt to ask!
This looks great! There's an old mod that also enabled this weapon, albeit with different stats and a more passive way. Going to leave the link here in case you'd like to check it and avoid incompatibilities.
https://www.nexusmods.com/fallout4/mods/18007
EDIT: I took a look at both mods in FO4edit and there doesn't seemto be any conflicts, so if anyone wants to have both versions for whatever reason, it seems there'll be no problems.
Both mods are using Vanilla textures. if the old mod looks better in screenshots it's probably because the author of the old one is using the HD DLC. Both mods are only ESP files and include no textures.
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https://www.nexusmods.com/fallout4/mods/18007
EDIT:
I took a look at both mods in FO4edit and there doesn't seemto be any conflicts, so if anyone wants to have both versions for whatever reason, it seems there'll be no problems.
Is the old version a higher quality texture or is the screenshot the problem?
If it's the same model couldn't we apply that texture to this version of the gun?
Both mods are only ESP files and include no textures.