Have TWRP Flash Stock KitKat ROM from Lollipop

Hi, pretty sure I'm being thick but having spent the morning searching I haven't hit upon the right terms to find the answer one way or the other.

I have a D855 which I unlocked, bumped and rooted when it was still KitKat and have kept TWRP in place. Having tried CM12.1 it's not stable enough for me (fair enough it's at nightly stage) so I thought I would try stock Lollipop. Found a flashable zip for it and it installed great. Tried it out, mostly great but, for me, the biggest problem with LP is that Bluetooth rSAP is borked in 5.0. This seems a common issue and looks like it might be resolved as and when the D855 gets LP 5.1 or Android M, but without knowing how long that might be I'd like to downgrade to KitKat again.

So my question is, and the thing I can't find, is there a flashable ZIP of the most recent KitKat based firmware I can use from TWRP? I think it would be (for the UK) this would be V10L (according to here , but the best I've found is V10E (according to here...

Have I missed something obvious, or alternatively should I create my own zip from the Stock KDZ or perhaps just use a custom ROM but with minimal debloating - but not too much as I like quick circle.

Thanks in advance, and apologies if this is obvious.