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https://www.youtube.com/watch?v=zbfQ5_6kyuM
You can acquire the updated variation of it that is equippable by Demo, Engie, Medic, and Sniper in addition to the initial Soldier and Heavy (Plus the alternate style) by extracting files via GCFScape.
Requiring either the self-illumination property to be disabled or the default RGB values to be set to what you want. Manually in the .VMT file and semi-permanent.
This is the same for every cosmetic that specifically glows and is paintable. I cannot provide an addon that does this for you.
If you extract files from TF2 to SFM via GCFScape you will acquire ALL models up to date in TF2 let alone the two you are looking for.
Following that, assuming Workshop is given priority in the search path, this addon should automatically use more fixed textures over the defaults.
A tutorial on how to extract files linked below.
https://youtu.be/zbfQ5_6kyuM