I'm going to answer my own question, as nobody else did!
I fitted oem pre lci xenons to my pre lci halogen e90 today. Coding to xenon breaks the operation of the manual level control so i didn't change the vo, so all i did was code out the two low beam checks:-
KALTUEBERWACHUNG_AL to nicht_aktiv (low beam cold)
WARMUEBERWACHUNG_AL to nicht_aktiv (low beam warm)
And of corse i did the 2 wiring mods, and it all works perfectly, except i won't get a warning if a xenon bulbs fails, but i would rather that than not have level control.
But still if anyone knows how to have level control and low beam bulb checks please let me know!