f2fs Stock OS

I have read much about f2fs and am looking to give it a try. Is it possible to install the TWRP custom recovery and format data and cache to f2fs and remain on stock software? If not, would it be viable to use a close to stock kernel that supports f2fs with the stock OS from Google?

Should neither of these options be viable, what is the closest to stock custom ROM that's running the latest version of Android released for the Nexus 7 (2012)?

Link2sd lost 2nd partition (f2fs)

While working with Link2sd, I moved a ton of apps to the SD's 2nd partition, using f2fs file system. Rebooting the phone (XT926 - 4.4.2 - rooted), the 2nd partition was no longer accessable and, of course, the apps vanished. Worse, I can't re-install some of them. I get the "not enough storage" gripe. Short of doing an FDR, is there any hope of recovering the data or at least making it possible to re-install the lost apps? FWIW, I tried reading the SD under Win7 (nothing found, of course) and SuSE Linux with f2fs.tools installed. Still nothing.

How SOL am I?

[Q] cm12.1+boeffla 4.2-beta4 f2fs

cm12.1 latest+boeffla 4.2-beta4 support /data, and /cache f2fs filesystem?