I have some good news
I have now managed to get the AI Project Constructor to work with App Inventors new blocks. I only started looking at this a few hours ago and below is an example of project I managed to merger in new blocks I have merged using a slidebar and duplicating the code use the AI Project Constuctor.

I noticed that when merging projects and I importing them into New Blocks if there is more than 1 screen1.initialize App inventor New Blocks gives an error which it doesn't do in the classic App Inventor. I will need to do more work and merger all the screen1.initialize & screen1.backpressed events before outputting the new project from the AI Project Constuctor to make the software more compatible with New Blocks.
I need to do a lot more testing before I release the the software.
I have attached the sample new blocks merger project for you to have a look at. The project should also load into App inventor classic.