LPi-autogas injector blocks oilfilter access on B207E LPT engine

[SatchSportSedan]

[SatchSportSedan]

Dear Forum,
I have a recent Viale LPi-installation, on my 2007 9-3 with B207E-LPT 150Hp engine
Now, the underneath hanging LPi-injector for the forth cylinder blocks mi access to
that black-round oilfilter cover that needs to be fully unscrewed ?
I was surprised that such profesional installation ain't thought about that?
See, attached pictures, althrough I hope I am not the only one confronted with this?
--------------------------------------------------------------------------------
Anybody, good sane advice, whether I can unscrew the metal ring holding that
injectors housing, where both electrical solenoid actuator wires come to.
Seen both LPi-autogaz Feed-& return lines jsut arrive above this ring;
I was wondering whether I need to un-pressure the LPi-lines, and how would this have to be done?
I was thinking about removing the fuse, while running stationary on LPi, until engine stalls?
I really hope some of you could help me with good sane-and safe advice on this,
since the LPi-installer is far away situated from my state of residence.
And LPi is not a similar installation as a more common evaporator LPG installation.
Many thanks in advance, Harry.