After 20 days of use I fully confirm that with Android 12 (62.1.A.0.675) there is no echo and no color banding / yellowish tint. Fingerprint sensor works much better than with any other Android version I’ve ever used on my 10 III.
Additionally, a small update is that both SW_binaries_for_Xperia_Android_12_4.19_v1c_lena and SW_binaries_for_Xperia_Android_12_4.19_v2a_lena binaries seem to work perfectly fine with SFOS flashed on top of Android 12 version 62.1.A.0.675. I’ve been using v2a for a few days and I haven’t encountered absolutely any problems. I think it makes a good match if both the underlying Android OS and the AOSP binaries are of the same version (in this case 12).
P.S. There are also newer Android 12 binaries (SW_binaries_for_Xperia_Android_12_4.19_v3a_lena.zip) but they do not work for me (no mobile network and no WiFi), just like Android 13 binaries.