Masonry boxes with extensions is my way to get the KO's back into the cinder block cavities. Plenty of duct tape is used. I also install an extra long pigtail at the rough-in.
Recommend ENT/SMURF TUBE with conductors ALREADY installed whenever practical. Combinational raceways with PVC sch 40 below grade and ENT up into the cinder cavities is practical, too.
If you can't install the conductors, install pull lines.
Don't hesitate to bump up the raceway one size for longer runs. 3/4" is a minimum inside a building, 1" is the practical minimum for any pipe that leaves the building.
