In the rule “Graffiti”, replace “Each piece of Graffiti is a publicly tracked string of flavour text, located in a Megasystem.” with:-

Each piece of Graffiti is a string of flavour text, painted onto either the wall of a specific Megasystem, or onto a specific Facility; all Graffiti is publicly tracked.

Replace all instances of “in the Megasystem that they currently inhabit” (if there are any) with:-

on a nearby surface

Then replace the instances of “in the same Megasystem you’re inhabiting” and “in the Megasystem you’re inhabiting” (if there are any) with:-

on a nearby surface

Then add a paragraph to the rule:-

A nearby surface for a Machinist is the Megasystem that they currently inhabit, and all Facilities (if any exist) in that Megasystem.