If you're fast and have lots of teleport to burn, you can just randomly teleport around Darkforge until you get close/into one of the treasury rooms. This is a pretty high-risk proposition since you still need to get out, but if you're really desperate...
If you work your way through the dwarf quests, Big Punch does enough damage to beat your way through the golems. Construct slaying missiles aren't super rare, so that's an option too. If you happen to have a scroll of familiar summoning, you can use it in Dwarven Halls or the crumbling cave (R6) to get a powerful pet. It's a bit of a lottery as to whether you'll get a useful pet, but about half of the available pets are probably strong enough to clear Darkforge. Of course, this last method means you don't get the xp from clearing the golems, but if it's just a weapon you need, that's maybe a way to go.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.