Any AOSP ROMs with network switching mode between CDMA and GSM

[ctzw]

I have tried stock ROMs, 4.4.2 or 5.0.1. Both can switch from CDMA and GSM smoothly (GSM is unlocked). However, when I tried AOSP ROMs, even after flashing the GSM netwrk patch here, it won't work well. The interface of switching network mode is absent. Looks like AOSP has to stay in one mode exclusively.. there is no way to switch between them. Am I right or just hasn't tried the correct ROM? If you know such AOSP, please let me know.

Thanks.