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!
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EDIT:
Appimagelauncher, gearlever, AM, etc. Which is the same as a install wizard since it integrates the appimage into the system. AppImages do not need to be extracted into the system which is what windows install wizards do.