The Flatpak is already packaged and works well. It just needs to be maintained from a person that joins the Inkscape community.
This would allow further improvements like Portal support and making the app official on Flathub.
Update: One might have been found!
And I wasn’t aware of the Elementary thing with Flatpak! Admittedly I hadn’t really thought of it in that way, I was thinking something more akin to F-droid where there are a couple of extra repos you can add which have applications not on the main one due to slightly looser requirements. But making it specifically for apps for that ecosystem in particular makes a lot of sense.