The Eonon Q30pro I had previously did have the windowed mode as do all topway based models, and the iGO Pal build worked perfectly, I used it daily for over 2 years so I know it can and does work, of course that could be due to the old unit being android 10 instead of Android 13 like the new unit. These new DUDU7 units have basicly the same thing under a different name, they call it picture in picture or PIP but as you can see in the youtube video DUDU has dual PIP.
I have done some experimenting by using the mod skin from here [Only registered and activated users can see links. ]
It has improved but not eliminated the issue, If I remove the save folder and reinstall using the original apk then it does seem to fix it completely, but doing that stops traffic from working so that just swaps one issue for another