I would think they would be pestered, but I haven't kept african cichlids. The biggest risk would be that they would nip at antenna (which can grow back) and cause the snail to not come out of its shell to eat (resulting in starving). Hopefully someone experienced with cichlids will chime in, in my opinion, it probably wouldn't work well at all.
Snails are a good food staple for most cichlids. Most africans will quickly devour them, as well as south americans.
Both my africans and S.A's devour malaysian trumpet snails. They suck them right out of the shell. That is why you see empty shells in your gravel.