How to have LLVM/Clang target an currently unsupported embedded OS?

I am writing to inquire re: the scope of the effort that would be
required in order to augment LLVM (and/or clang++) to be able to
generate from modern C++ source code a set of Microware OS-9 ROF
(relocatable object format) object files to be subsequently linked (by
the existing linker from Microware) and executed by a 68k-based
processor running the OS-9 operating system.

Material posted online such as

and http://geneslinuxbox.net:6309/gene/toolshed/casm/HTMLHelp/os9_rof.htm
give some insight into the specifics of the ROF linker format.

Could such a project reasonably be undertaken by a CS Ph.D. student
without significant prior familiarity with LLVM and Clang? If not,
are there firms that specialize in such work?

I understand that Motorola 68000-based targets are not presently
available as an official LLVM back end. In this regard, does anyone
know if what is online at LLVM 68k Backend download | SourceForge.net is presently
in good shape? What would be necessary besides a volunteer to conduct
automated nightly testing of the backend in order for such a back-end
to become officially supported?

The overarching purpose of the task is to make available clang++'s
high level of C++ standard conformance to this unusual platform (which
must be used due to regulation). I would also be interested in other
potential approaches that might be simpler to successfully execute.

FYI, the current cross-compiler that is used to target the platform
supports C89, at least some parts of C99, but has only basic
(pre-standard) C++, e.g., it lacks SFINAE support.

Thank you in advance for your advice,
Dave Gomboc

did you get that reply (posted under wrong topic) http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-June/087350.html