I'd like to use this mod on a Minecraft 1.15.2 server.

I guess that you library-mod WumpleUtil needs to be ported first, so tried to help out with that in:
Stormwind99/WumpleUtil#1

Can't get the runClient to work, but putting the jar-files in my minecrafts mod-folder works fine.

So the branch 1.15.2/master should work when WumpleUtil is updated.

To test it before that, use

• the CannyComposer branch 1.15.2/WumpleUtil
• with WumpleUtil branch 1.15.2/fake

Got some problem to get my compiled WumpleUtil to work, so tested to just copy over the required files, and remove the dependency, and got it working on 1.15.2.
see branch 1.15.2/no-dep

I'll keep digging in why my jar-file wont work as dependency.

Great! Can you submit pull requests?

What branch do you want the PR too?
guess you don't want it in your default branch 1.14.4.
Maybe you want to create a 1.15.2 branch first, or is your master branch a good place?

I created branch 1.15.2 so it can be the target of a merge request.