Realtime exchange codec thru kona 3

Hi,
I've updated to latest Kona drivers for a Kona 3 HD / OS 10.5.1
Previously I was exchanging footage (from fcp to after effects then back to fcp) via the following worflow :

- export from timeline in FCP 1080 25i 10bits uncompressed 4.2.2 -> AJA 2vuy

- import in AEFX as without conversion, then render in 10bits uncompressed 4.2.2

This is how my footages keept the exact look (luma/chroma), and most of all, rendering in 10bits uncompressed 4.2.2 was handy, because FCP did not have to render re-imported footages.

Now I've updated, I got the following workflow :
- export from timeline in FCP 1080 25i 10bits uncompressed 4.2.2 -> AJA 2vuy
- import in AEFX as without conversion, then render in AJA 2vuy
otherwise, footage is altered when re-imported in FCP.

As you can read, my problem is now that I have to deal with AJA 2vuy rendered AEFX clips, and final cut has to render those footages when back on original timeline.

My question is : is there any other exchange method between FCP and AEFX, then back to FCP, so I can play it back in realtime with FCP, with exactly the same picture quality than original footage ?

I can live with FCP rendering, because the 2vuy is perfect for keeping original's footage quality, but I may loose time here.

Thanks for the tips.
Regards