When you register for WeChat, you could consider doing the following:
a) Register with your monger number only
b) Then register the account to your munger email so you use 'other login' method, ie you enter WeChat by email instead of phone number
c) Disassociate your phone number from your WeChat account.
While not perfect, it does mean that to get your real ID is a little harder.
I guess to be even more cautious, you could register your wechat account (Step 1)when you are overseas in a country that doesn't register SIM cards, like Philippines.
And just to clarify, I do not solicit, either in person or via telecommunication devices, I would just not prefer to be involved in any polite police enquiries or have girls contacting me at home.
BD