I don't think DeepL translated your comment correctly... soo...
You're welcome, :D

If you are interested (I don't know if I mentioned this before) I have a blog that I use for general news about the comics and what I do. You could consider it a "history" of how I changed my mind.
My last post was in january but I am planning some new posts with some info.

https://the-heretic-locomotive-news.blogspot.com/

Sadly it's in english... so... :(

I see... this chapter I'll keep it as it is with all 3D characters, I may try what you said in the next one, depending on what it will be about... another thing I could try is to keep characters that look good in 3D but not in 2D and characters that look good in 2D but not in 3D or cannot be done in 3D
But I'll need to experiment with physical interactions between 3D and 2D characters, witch is already hard enough as it is in both styles.

I don't have main characters. In each chapter I focus on a set of character.
I actually did what you said with the russian android soldiers, they were all 3D models blend with the 2D characters.
I only convert characters that I know will appear and not all at once.
Backgrounds are easy to make, so no problem there.
The models are backed up on a external drive but that does no guarantee they will work, I had problems before on my last migration to a new PC.
Also, one advantage to the 2D characters is that I am limited only to my own capabilities and not to the software and models like with the 3D ones. (I have to give up on a lot of ideas and designs for the 3D characters)