Sorry I forgot we were using Labyrinth Lord rules. There is no Dwarf Fighter/Thief. You, Imperialus, don't mention using the Advanced Edition Companion for LL, but that tome does permit Dwarves to choose from the classes Assassin, Cleric, Fighter, and Thief. If you want to limit this game to the basic LL rules volume, and you evidently do, my replacement character will be a Dwarf Dwarf (race doubling for class).
LL Basic Dwarves have a 2 in 6 chance to detect traps, false walls, and/or hidden construction, so that basically covers why I wanted a thief, and I am perfectly happy with just a Dwarf Dwarf.