I think the Israeli tank-converted APCs exit mostly on the top. Israeli tank->APCs (some reclassified as engineering vehicle) include: Puma, Nakpadon, NagmaSho't, Nagmachon, Achzarit. All of these but the Achzarit (not sure about the "don", the flat topped one made from the Centurion) dismount troops through the top, and the site admits that this is not a good thing. The Puma is now reclassified and re-equiped (can still carry 5 troops) for engineering purposes.
Site: Israeli-weapons.com
The Achzarit is awfully low, shorter than the BMP-1, Type 89 and MB-LT, at least it seems to be according to the way the door works. If China decides to do what we are discussing on, they could maybe raise the entire top, but troop dismount is still a problem. (If you look at the Nagmachon, It has some sort of door back of the tower, don't think it is for troop-dismounting, but still, maybe an idea can arise here.) And I doubt China will actually reposition the driver so that the back becomes the front, and whatsoever, but allowing troops to exit-rear.
In other roles: The old tank can be modified to become the type 59 ARV. (The Marines have these too, even though they aren't amphibious.) AAA works, for example, the Type 80 57mm AAA. I don't think it would be smart to turn it into a SPA however, since the 122mm is already here on the Type 63/77 Chassis.
The AAA role might fit the bill pretty well. This tank is small enough to fit onto city streets, and while it faces airplanes in the fields, in the city it faces RPGs from the top of buildings. Regular tanks can't shoot these enemies since they can't raise their guns enough, and if using their guns, will risk suicide if the building is weak. If converted, they can shoot them easily, especially with IR. Such a conversion also means dropping the 100mm gun and ammo, which might sound bad, but having AAA allows you to stop the enemy from attacking you without destroying them. (Art of War + Recycling/Conservation) Plus, you now need only 3 men and can have a lot of ammo at your disposal.
Too bad though, China also has the Type 321 chassis, so I am not sure how this will fare against it.