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!
Checksums are not for authenticity, and link me to the docs that indicates that ostree’s optional encryption is enforced in flatpak
I didn’t say they were. Hence the second link.