This is indeed a very odd system you are dealing with. I have never heard of a bag offer that is not what the client requested effectively serving as a "take it or start over".
FWIW Togo is fine with a few raindrops, maybe more than a few

, certainly as robust as Epsom, but if what you really want is a noir sellier Kelly in Epsom or Box, you should hold out. Epsom and Box are
very different, of course, but in sellier you are most likely to be offered one of these two leathers.
I accepted a bag a little over a year ago that was a true classic, but the wrong color hardware for me (Noir Togo K28 retourné but GHW) and I still haven't carried it, so small things can end up making a big difference. Wishing you luck.