Would this be an acceptable migration path?  Magit requires Emacs≥25.1
if I am not mistaken; I don't know how portable this solution would be.

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37774#212
    AFAICT no-one outright rejected this idea; I apologize if I missed
    someone pointing out shortcomings.