I tried to upstream some of my refactorings/modifications needed to support this, but it was rejected by upstream [1]. I don't blame the Ghidra project for this decision ; my modifications are fairly intrusive (modifying the relocation table after the initial load, extensive refactoring of the ELF support code...) and my workflow is essentially unproved in public.
By that I mean I have no documentation, no series of technical articles describing this process and no public, non-trivial project to demonstrate it in real life. I do have a currently private decompilation project that uses this successfully [2], but it's not currently public and it's nowhere near finished.
Also, I only wrote a relocation synthesizer for statically-linked, 32-bit, little endian MIPS ELF. That's a fairly obscure platform, I'd expect most people care about mainstream instruction sets like x86_64 or ARM64.
If you can suggest a forum where people would be interested in this, I can drop a message there and answer more in-depth questions if you want. So far I've worked on this all on my own and I'm kinda out of the loop from the rest of the reverse-engineering community.
