Could you use the numpad keys under fn? For example fn-J is numpad 1 and fn-K is numpad 2.

Edit: You might also use a private.xml private.xml like this with KeyRemap4MacBook:

<?xml version="1.0"?>
<root>
  <item>
    <name>test</name>
    <identifier>test</identifier>
    <inputmode_only>CHINESE_SIMPLIFIED, CHINESE_TRADITIONAL</inputmode_only>
    <autogen>__KeyToKey__ KeyCode::KEY_0, VK_SHIFT, KeyCode::KEYPAD_0</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_1, VK_SHIFT, KeyCode::KEYPAD_1</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_2, VK_SHIFT, KeyCode::KEYPAD_2</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_3, VK_SHIFT, KeyCode::KEYPAD_3</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_4, VK_SHIFT, KeyCode::KEYPAD_4</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_5, VK_SHIFT, KeyCode::KEYPAD_5</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_6, VK_SHIFT, KeyCode::KEYPAD_6</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_7, VK_SHIFT, KeyCode::KEYPAD_7</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_8, VK_SHIFT, KeyCode::KEYPAD_8</autogen>
    <autogen>__KeyToKey__ KeyCode::KEY_9, VK_SHIFT, KeyCode::KEYPAD_9</autogen>
  </item>
</root>

Press ⇧,

Press the ⇧ shift key, then press the , comma key, which will insert a !.

This also works for the question mark above the .