It would be nice if Ai could allow to split a blend in a step defined, effectively creating two merged blends — something that CorelDraw was able to do for years.
Here is the demo
Take a look. I have a two-object blend, I split it, I have a three-object blend now, that has a middle object made from the middle step I chose. Each of these two now-combined blends has its own quantity of steps defined.
Scott Falkner commented
Can you show an example of what you mean?