I still think Steven Palazzo, Phillip Gunn are possible.
If Bryant really wants to be canny, he can appoint Hood, because even in a Dem midterm it's unlikely a Democratic incumbent will win in Mississippi, and Hood being the incumbent other Republican will encourage other Republicans to join McDaniel in the race (and maybe beat him).
Even if Hood does win in the special, he'll lose in 2020 anyways, as he probably won't outrun Republican turnout atop the ballot.
It won't be Palazzo, because that would surrender his House seat to the Democratic challenger - it's past the filing deadline for another Republican to run for that seat.