Patchmanager for SailfishOS
https://openrepos.net/content/patchmanager/patchmanager

Patchmanager is a tool for transparently modifying installed files by the patch utility and for managing the special patch files ("Patches") for doing so.
Since version 3.0, Patchmanager does not modify original files on mass storage, it merely alters their content when they are loaded into RAM to be executed.

Note that Patchmanager does not install an application icon on the launcher, but creates a new entry in SailfishOS' Settings app.

Issue tracker & source code repository:
https://github.com/sailfishos-patches/patchmanager