Can't tabulate all of these at the moment but this is my general outline:
Opponent plays 4 highways (golds now cost 2):
This allows:
Each sab to run through your entire deck & flip all your tunnels for 8 golds per sab run.
Minions with perfect shuffle luck, your first 2 minions dump 8 tunnels for 8 golds, your next 4 minions gain another 8 golds, your last minion gains you 4 more for a total 20 golds. You should be able to drive that higher with secret chamber.
There are many other discard attacks that can cycle your golds, but I think the best is noble brigand - discard tunnels and gain coppers, followed by oracle and perhaps margrave in there somewhere.
Gain caches from ambassador, swindler, jester, or governor. I think the easiest shot would be either to ambassador it over or to jester them.
Mountebank - 2 silvers per play with revealed trader (next best action to KC)
The above would be my main priorities. Below are the single coin gainers in descending order of ease of use.
Governor - gain silvers or upgrade BV -> bank (must be done after the sab craziness)
Igg - trader curses to silvers (can happen either in action phase or in buy phase)
FG - gain golds
Embassy - gain silvers
All the curse givers - gain a silver
Jester, etc. allow you to give over treasure other than cache.