That is a good idea, extra chances of getting Doran out on time is probably worth the slightly smaller body. I am not sure which of the 1-drops would be better to replace; losing the incidental life gain from the god-pharaoh's chosen seems fine even if the harbinger is smaller, but removing the ancestor would really reduce the need for early black mana. I think the grazer is worth keeping if only because it can trade with delvers and dragon's rage channelers.
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Tourach, Dread Cantor seems like a worthy consideration if you really want to empty peoples' hands. Likewise Lilianna of the veil for similar effect, but she has the upside of putting your own bloodghasts and deadly allures into the graveyard for added value.