I cannot be sure if SK will track level change and alter the THAC0&co. accordingly, but there is a neat way around: alter the experience instead. When you load the game, you will level up and gain those bonuses.
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Dulce et decorum est pro patria mori, adhuc dulcius pro patria vivere.
(It is sweet and glorius to die for one's homeland, even sweeter to live for it)
Horatio
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