Mint, Cinnamon is interconnected with Synaptic.
Cinnamon was made mainly to not to go with Unity. Since then, Linux Mint became a quite separate distro, not something that just changes few wallpapers or themes. The thing is, Clem never forked Ubuntu, but
used as a package base and regarded as an upstream component.
They went on making Cinnamon better, while Unity stopped. At that time, two unique DEs happened, Unity and Cinnamon, the rest is history.
You can try to reach out, but I don’t think they are interested in having an Ubuntu Cinnamon remix. It won’t be in their interest to have an additional “remix” that goes against their philosophy. They release only LTS ones, and point releases. The next LTS would appear few months after the Ubuntu 20.04 LTS.
In the case of Linux Mint, we try not to introduce incompatibilities with upstream package bases, so we keep the same libraries, same versions and we do not fork the base.
Anyway, try to build the remix. Try it with the mini.iso. You can install the mini iso on an UEFI system.
Here’s how Ubuntu disco looks with the Cinnamon packages in the Ubuntu repos. It has Cinnamon 3.8.8-1
Quite different than the Cinnamon here
. Looks bit older. The Mint-Y icons don’t work well too – too small. In the Disco-Cinnamon, they look normal.