As far as I can tell from the jitter docs, no; the big thing about copy and patch is that you can piggy back on the existing C compiler and whatever backends it already supports.
Does jitter compile C at run-time or just stitch it together? (EDIT: looks like stitch at run-time)
The other thing C&P does is allow for a library of stencils and stitch them together intelligently depending on where arguments are coming from, where the return should go, where the flow of control should go next, etc
fwiw i thought this was a stupid, hacky, pointless approach when it was called jitter and i still think it's a stupid, hacky, pointless approach when it's called copy-and-patch ;)
You could probably do the same thing with some hacky C++ code gen and templates, but I'm not sure clang et al would be able to optimize them.