2 Stage reduction kits

[Chromotoast]

Hey friends I’m back. Recently I made a post about building a diy mid drive and then got side tracked with some other stuff. Anyway once again I’m asking for some help. I’ve realized I’m going to need a two stage gear reduction. Obviously there are many options/routes, jackshafts, gearboxes etc, but does anyone know of any simple kits that are available instead of building one myself. I’d “only“ need like a 8:1 or 10:1 reduction. Has anyone used one of those cheap mini bike transmissions you can get for like $30 online for a two stage? I tried looking through the forum for kits but couldn’t really find much, but maybe I missed something.

Thanks!