How to install plugins without using a third-party host?

[Heliosurge (Dan DeMontmorency)]

@Willy

I’m not kidding when I say they’re very small. For example, one of them just adds a button to an external page on the home page, and that’s it.

I am wondering if you mean Customization > Plugin or Customization > Theme component ?

For example the custom button on Home screen, could be accomplished with a Customization > Theme component . A TC can be laid out in a zip file(maybe best route to have full TC structure) or even entered in creating it/inputting code in the Create Theme component using the internal use.