You'd be better off replacing Achilles with someone else, preferably Mordred with Sniper Shot, assuming you have both. You might lose a bit of burst damage using a SR weapon but that honestly doesn't matter since burst damage makes up a very little amount of your total damage unless using Siegfried. Regardless, the utilities Mordred brings in is far makes up for it since you don't have a b-frame atk/def down buff which she brings and black propaganda. The only loss for using Mordred is slightly less PP from her dots. Put Artemis back in main replacing Orpheus. Dike's def down debuff isn't the strongest but better than a ability dmg up buff from Orpheus.
Achilles is also terrible for auto battling.
Raid events have been pretty easy in the past, unless there's some drastic change starting this one, I don't see you having much trouble with that team regardless of if you change up or not.