What i read is that i could use a plugin if it’s freely available. The substance plugin is the only way to use substances in Unreal, i see there is other substances package on the store so that should be fine. Also i’m only showing some example from the substance i’m selling but you can do many many more variation of the texture with it.
Here is a screen of this substance options:
Other than that it’s using PBR, values may not be realistic due to stylized choices and i put a few roughness option up to the user inside the substance settings.
You might be right that there is not enough in quantity and i could pack a few other substances, if it’s a problem of quality then i will have to see how my future substances look…