this sounds like by far the simplest solution from the SPM side. i have also heard of people doing this manually, so it would be an easier adoption than the other three ideas.
do you have any advice for the @Finagolfin and/or the maintainers of Embassy? right now, supporting Android is a very unattractive choice for library projects because it prevents the library from using any dependencies that do not themselves support Android. and this has a cascading effect across the package ecosystem, because most packages depend on other packages.