> Related to this issue, I am playing with an idea to introduce a new
> option to guix system reconfigure that would skip the forward update
> check. While it makes sense, especially lately it shows how problematic
> it can get. […]

I’m not sure I follow: even if one uses a mirror of Savannah, downgrade
prevention works fine.  Or are you referring to some other motivation?

Thanks,
Ludo’.