Hi,
I didn't find this proposal in the archives, so let me add something to this discussion. Does anyone know about FlexiBLAS [1]? It seems like the perfect solution to this problem, and AFAIK, only Arch packages it. Here's a presentation [2] about it (not up-to-date with the current feature-set, but still interesting).
TL;DR, the general idea would be to build everything in Fedora against the libblas.so, liblapack.so and libumfpack.so wrappers provided by FlexiBLAS, and then it redirects the calls to the proper library (that could be openblas-serial by default, of course). Then it provides the user with a nice mechanism to select a backend (not based on update-alternatives, no root privileges required). Additionally, it embeds some profiling capabilities, which is really nice.
I think it's very much worth a try. Opinions?
[1] https://www.mpi-magdeburg.mpg.de/projects/flexiblas [2] https://www2.mpi-magdeburg.mpg.de/mpcsc/software/flexiblas/2018_talk_fin_fle...