I have personally handled the assignment of radio call signs, and I understand that the last letter you mentioned might be a zero, but it's impossible to assign a call sign ending with a number because these are automatically generated. When printing the radio license, the call sign is automatically displayed without any possibility of having a number at the end. However, if you're referring to the call sign assignment system of the Ministry of Industry and Information Technology (MIIT), I don't know if there are any special call signs that use a number in the last letter. But it seems that such call sign assignments are illegal in China. After playing for so many years, I have only encountered one three-letter call sign where the last letter was a number, and at that time, I even doubted whether I had misheard or misread it. I checked on QRZ.com to confirm that it was a valid call sign. I remember it being an African call sign, but I can't recall the details.
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