I want to develop an AR painting app on the Meta Quest 2 - am I on the right track?

Hi there, new to AR development and needed some sanity checks about my idea -

The app I have in mind will allow users to paint on a flat surface (using Plane detection) like their floor. TLDR; I have a reticle thats aligned to it and they can move around to color it in-

the thing tripping me up is whether the simplest way to show the painting over the real world plane is to render something like a translucent Canvas virtual object in Passthrough underlay (overlay?) mode, align it to plane detected and do all my texture manipulations on it?