Use the flail at first then switch to Crom Faeyr.
I did that but I did dual wield them eventually with my 9th level fighter/ 35th level cleric dual class in ToB.
Incidently there is a really good hammer in ToB so you can get away with dual welding hammers if you want to.
I think the slow effect of the flail is a great balance as is the extra damage against stoneskinned mages.
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