[Q] Can I upgrade from a 4.3 based CFW to 4.4.4 and keep my Custom Recovery topic

Hi Guys,

Hope someone a bit more clued up than myself can clarify my questions or guide me..
I've done some searching, but am not 100% confident.

So, I have a I9305 running a Boeffla Kernel 5.2. If I recall correctly, I upgraded from 4.1.2 to 4.3, but
kept my old bootloader. So I am rooted and have TWRP on this 4.3 based CFW. No KNOX anywhere.
(Did all this about 12 months ago or more, and have had some significant life events in the last year,
so have been completely out of the scene.. :( )

I've had a few issues with this CFW. Namely battery drain relating to "mdm_hsic_pm0" and a couple of
other kernel wakelocks, a camera driver that freezes the app every so often, and less than spectacular
modem connections.. But I digress..
Anyway, I was considering upgrading to 4.4.4 (stock)
Can anyone tell me if I can do this and remain Knox free and have a custom recovery such as TWRP.
(If so can you point me to a working guide?)

Thanks Heaps in Advance,
BrikHaus