I second this. The amount of people who got into the brony community through all that incredibly popular youtube music despite the whole thing looking weird is just huge. I myself was a fan back in the day and still listen to it from time to time.
In the case of VNs no one has even heard of them, and when I looked for remixes on youtube I found practically nothing, only remember one good remix for Air, one for Rewrite and one for Little Busters - and only the third one has a sizeable amount of views, being a bit over 20.000. Well, there were a few more but many of them just seem like your typical nightcore remixes made in 10 minutes. Do I even need to explain that pretty much the only people who see these things are the ones looking for them in the first place?
Unfortunately, it's the kind of thing that requires you to be popular in the first place and risk losing a part of your fanbase unless it was anime-based to begin with and you only reference non-ero VNs.