Spoken like a true engineer 
Artist dirty little secret: There’s no right or wrong way. Just good ways, and not so good ways. shhh…don’t tell anyone 
You’re welcome to distribute the couple that i made and posted here if you want https://forum.nomadsculpt.com/t/my-matcaps/1523?u=pxgeek (the white one I find handy). They’re 8bit pngs, painted in affinity photo, but the forum compresses image uploads.