I think I have seen this brought up before. If I am running my beast build, I can get 300-400-500 charges rather quickly, but others seem to have a hard time. I guess I think a free 100 charges upon logging in would be fine.
Of note, I think if you wield one of the shields from the neko shops you get a 5th charge point per turn? That adds up with time.
Lastly, you touched on something that is a problem . You alluded to "if you don't have a whole inventory dedicated to Neko"
Thats the issue. There just is a total lack of good BM items. The better stuff is all seasonal, z token,or guardian. Not one F2P charisma weapon. There just needs to be a lot of time on revamping old outdated items, even if its a complete redesign of mechanics to compliment BM's, as well as several new items that need released. The same can be said of other things too, which is why I think there needs to be a focus on updating older stuff over creating new stuff this next year.