We do not have the He111 but we do have the lanc...........
Which carried Tall boy and Grand Slam bombs.
The Tallboy was housed in a modified MkIII bomb bay.
So all HTC need do is add a new (perked) AC (Lanc MkIII TB) with the single loadout of the Tallboy.
............and AH gets a 12,000lb earthquake bomb.
The nice thing about the Tallboy is that its difficult to abuse its power..........to be effective as an earthquake bomb it had to be dropped from some 18,000 ft above target to get the impact velocity required to bury it prior to detonation.
Below this height it became no more effective than HE "cookies".
3 of these dropped from formations at the proper altitude should be "field killers".