There is more latitude than most people realize in the words of Chaza"l as they apply to a particular person in a particular situation. What is rightfully labeled as "neged Derech haTorah" in one situation (like some of the behavior that the original Mussar derech [and original chassidim] espoused - which made Reb Yisroel [and the maggid and friends] so controversial) may be exactly what Hashem wants from a yid at times. And particularly when the yid we are referring to is already stepping - actually, living - outside of the bounds of "Derech haTorah". Especially if the yid we are speaking about is not just doing an aveiro here and there, but actually has twisted thinking and has a heart, mind and body that is not successful at being a decent kosher guy like most other people in the community.
This yid may need to use unusual tools that express Hashem's Will just perfectly. Kind of like how Hashem's Will is expressed through a child becoming ill or worse, sometimes. Strange, no? Not very nice, no? We say Hashem keeps the Torah - but is it mutar to kill 'innocent' people? Well... it's not that simple, though the community at large desires a great deal to keep it looking that way. And I believe that desire is where resistance to addiction recovery is coming from and always will. At it's most raw and basic level of practice, the recovery derech has to be wrong for normal people, for it is not made for normal people.
Only one who really sees 'the end' in view will have the motivation to naturally reach for G-d. A goy just as much and as deeply as a yid. The reaching will be done differently, but the motivation is the very same in recovery that I am familiar with.
I am not too concerned with what lav suicide is - I have my own reasons for avoiding it. And I dare say that you are the same. When death stares us in the face and we are slipping off a real cliff, we will grab for Muktza on Shabbos, too. You will, too. And it will not be because it is halachically permitted - all the cheshboinos are off when your life/my life is actually, directly threatened. That is the root of the halachik reality.
So if what you are talking about there is truly 'serving another G-d than Hashem', I agree with you in theory. In practice, I do not believe anyone who says we need to resort to yoshke or to any other false beliefs in order to get better from addiction. I believe in Hashem's Torah, in Chaza"l, and in what I see before my eyes: that even though it is false, my body truly, deeply, and innocently believes that lust, porn, and masturbation are in my very best interest. That's 'addiction' and that is what many of us have to work with here, rather than deny it because it is supposedly against the Torah.