Do you think you could fit an EFP capable of taking out an armored vehicle (from the top) into an 81mm mortar? Maybe with rocket assistance?
With drones, it seems like it could be a killer option. Small drone spots, slaps on a laser late in the trajectory to guide in the EFP. The EFP allows for rapid change in trajectory to hit moving vehicles, sort of the way the fancy new Excalibur's work (or older BONUS shells).
Because this way you don't need line of sight and can reach out like 6.5 kilometers, longer with a loitering munitions.
I would imagine 60mm would be too small, but they also now have fully autonomous ones which sound like they would be great on an IFV. Just send stuff in via drones, or even using networked rifle scopes