No, it won't work well due to the mobility requirements. I main RSHM + BDK + 3 DEMO and it's atrocious. I seriously hate BFA because of how badly tuned the M+ scenarios are.

All because of the mobility requirements. As in everyone basically needs to be moving a lot and your movement is naturally going to be exaggerated multiboxing. The worst offenders are going to be King's Rest, Atal'Dazar and Shrine of Storms (last boss requires DPS have interrupts). Your easiest ones will be TD and Waycrest Manor. Siege might be impossible mechanically.

You'd be better served going with a melee comp or BM hunters for a M+ team.