Unfortunately there is the problem of having to pay extra, but I usually build most of my games in C2 and just temporarily update to C3 when I publish to non-UWP platforms
Sadly this means that in a lot of circumstances you'll need to find alternatives to features or plugins, or simply wont be able to use some that are available in C3.
EDIT: Youll need to already have a license for C2 owned, since they don't sell that anymore.