I would assume that as much trouble as manufacturers have keeping up with demand for completed guns, that spare parts for sale will be very limited for some time. I believe in the past SW has offered PC kits with slide/barrel combos but my best guess is something like that for the EZ is a long way off.
I’d add that I owned a PC Shield 1.0 and that while it was a great overall gun I wouldn’t bother adding the ported components to my EZ. Now if just a different barrel is desired that may be an option though not sure if 3rd party companies have designed new EZ barrels yet.