Interesting, very interesting
I have always wondered how the Culin cutter which is narrower than the width of the tank hull (i.e. width between the tracks) could make a hole big enough for the whole tank to get through.
Using them to make holes to put explosives in makes sense in a way but the poor sod handling the explosives would be exposed to enemy fire.
I would have tried with a conical "hat" on a steel tube, the "hat" has a larger diameter than the tube, the tube is firmly attached to the tank (like the Culin cutter), the tube contains an explosive charge which is fixed to the "hat" and with a sufficiently long cord and rip detonator to the inner end of the tube. The "hat" has a larger diameter than the tube and is very loosely connected to the tube. The tank rams the tube/tubes into the hedgerow and slowly backs out, the hat sticks in the hole since the "brim" is larger than the tube, the explosive charge stays with the "hat" since it is tied to it, the rip cord is pulled out when the tank backs away and the detonator blows the charge. If cardboard tubes were available they could be used to enclose the explosives as long as the whole thing fits inside the steel tube. With more advanced workshop facilities it could be possible to have prongs on the "hat" with springs to push them out into the soil of the hedge (think arrowhead with barbs).
/ Robin