In the uppermost levels of the dungeon, add (non-guaranteed) fake bones piles which contain starting equipment from some role. Gear is eroded or biased towards negative enchantment, most magical items are removed, and perhaps one or two non-starting items are added. Then the whole pile is mostly cursed as usual.

Note: This has been implemented in 3.6.1 but differently; it places random cursed items instead of selecting starting gear.