p5.js Instance Mode: Encapsulating Global-Scope Libraries

Integrating p5.js into complex web applications often requires Instance Mode to prevent namespace pollution and allow multiple sketches on a single page. In this mode, the library wraps setup() and draw() within a callback function, requiring all p5-specific variables and functions to be prefixed with the instance object.

A challenge arises when utilizing external p5.js add-on libraries that were designed exclusively for Global Mode. These libraries typically expect functions like createCanvas() or random() to be available on the window object, creating a compatibility gap when the main sketch is encapsulated.

What is the recommended architectural pattern for wrapping Global Mode libraries to make them compatible with a p5 instance? Can these libraries be initialized to reference a specific p5 instance without modifying the library's source code?