You still need an ELF loader, unless you're shipping shellcode. As far as I know, there's currently no great way to load an arbitrary segment of memory as an EL

You still need an ELF loader, unless you're shipping shellcode. As far as I know, there's currently no great way to load an arbitrary segment of memory as an ELF, without doing some sort of copy (eg. memfd_create, write, exec).