As long as you have the find traps skill at least 90% (or over 100% if at all possible) then you can dual-class the thief whenever you're ready. You can use knock spells on normal locks or stock up on potions of master theivery, which give +40% to open locks.
Backstabbing will never be a major factor in the game, so I wouldn't worry about that. Nevertheless, thieves can use crushing weapons so give them a decent hammer or mace.
I don't normally use thief/clerics, but I generally enjoy thief/fighters.
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