How can I override all Insurgency/Source game mode settings?

I want to apply some Insurgency configuration to all game modes. For example, mp_supply_token_bot_base 20 for Checkpoint, Occupy, and all other modes.

It seems like the Source engine configuration files get executed in this order:

1. server.cfg
2. default_server_{gamemode}
3. server_{gamemode} (if it exists)

So, I can't just put things in server.cfg, because the default game mode files will override them. I can manually create a file for every game mode, but that's tedious. Is there a better way?

Ideally I'm looking for a .cfg file that runs very late, after all other config files (including default_server_{gamemode} have run. That way I can override all the default_server_{gamemode} files with just one file.