There are plenty fo quaility Hammond "clones" out there now but for doing Hammond on a multi purpose keyboard my Roland BK9 does a passable job. At least you paly with semi real drawbars and other settings like percussion unlike the boards with a fixed sample sound.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer