I will leave a (well earned) comment.
The way I look at it now, the only thing I will need, is the appropriate strings that needs to be generated for each component, which I can get from your design app, unless you are prepared to give me (only) a list of them, thereby protecting your original work.
I envisage a Qt6 WYSIWYG program which will work just like the Qt6 Designer, but instead of generating Python code, it will generate the appropriate strings that your Android App expects.
Those strings then can be read by a "USER" written (Python or other language) program which could send it to the Android device, via the various methods that you provided. I also hope, that while using this graphical designer (as long as a phone is connected), will display every step as the design is developed, just like your designer.
Those are the only thoughts that I have so far. I understand, that this is going to require a significant effort, but considering that I am retired, it will give me a chance to give back a little to the computing (and hopefully many more users) community, which enabled me during the past 65 years of coding, to make a good living, and enjoyment, which is still continuing to this day.
Your comments are more than welcome.
Bob Stanton
bobstantonx@gmail.com