You can use your local development repository downsteam
by adding it as an editable mode package, which also means
that you can test it in a consuming project without creating
a new package for this project every time.
conan editable add . \
pynest2d/<version>@<username>/<channel>
Then in your downsteam project's ( Cura ) root directory
override the package with your editable mode package.
conan install . \
-build=missing \
--update \
--require-override=pynest2d/<version>@<username>/<channel>