restructuring your work

A couple of days ago, I found a way back into my book, maybe the new moon on the 4th of June gave me an opening. I took it. I'm still not out of the woods, but I have a lead. I never give up hope; with writing, you can always find a way. The book is written in first person, with tense varying from past to present. I have been dreaming about switching up narrators, alternating chapter to chapter, yet I really love coming from the voice and perspective of my female lead, my heroine, and a change would be risky. This is serial fiction, after all, and one should expect consistency across books. Still, a slight departure from the first two books - in voice or person - could be pulled off, I thought, so long as the plot and characters held together. I've been dreaming about this for months (and not on purpose), and I found a compromise. I started interspersing the main narrative - chapters rounding out at 2,000 words each - with slices of 3rd person narrative about 500 words each. The body is therefore still under the auspice of Ame, for protection of what I have established (in the first two books), and guidance. Yet I am letting in light of special circumstances, subchapters pertaining to Kell, describing her experience simultaneous to and interwoven with the plot. I was thrilled to have envisioned this, and I believe it's rather unusual for an author to switch back and forth from first and third person. But it seems to be working so far and it's an intuitive hit. Let's see now if i can pull it off!