That is the way it's already done for arty with a solid AT shot. (IIRC it is more common in WW2, MBT uses HEAT in the main). See weapon 117 in the UK OOB for example.
The method gets a note in passing in the Mobhack help. See the yellow box in the weapons tab, containing the following:
Quote:
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PLEASE NOTE:
"AP ammo" can also represent earlier or alternate versions of SABOT ammo in much the same way that "Sabot" ammo can sometimes represent AP ammo when used by on map artillery.
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(Italics mine)
cheers
Andy