Both would be nice, but keep in mind WW2 era turrets were tight for WW2 era people (though I suppose by 2000 most folks would be making Depression era manual laborers look husky and corn fed), and the problem isn't just the gun it's the ammo, the feed chutes to get it from storage to the gun, and such. Shoe horning all that into a space formerly occupied by a manually loaded single shot gun is going to be a pretty major engineering undertaking.
Realistically, if a government/cantonment/whatever had access to a lot of manufacturing and machining capability, they'd probably be better served dropping in a whole new turret into vintage light AFVs rather than trying to jury rig a less optimal solution. (Tanks could be a different story, since I don't think anyone circa 2000 -- with the possible exception of the French and maybe Japanese -- has the capability to fabricate new MBT turrets).
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