That seems kind of extreme. Idk how many guilds raid like that. But it’s likely the only way. Maybe there’s a macro script you could write to auto master loot everything to yourself, but I haven’t seen one. (Haven’t looked either)
Aside from that I would just make sure someone that is not a tank or healer is the master looter. And they can loot up whatever’s needed and dps afterward. Their parse will obviously trail behind everyone else’s by a bit, but if they’re the raids master looter then I’m sure their dps and effort won’t be in question.