No worries
All I know is that once you're through detox, staying off a heavy habit, whatever the drug is, involves changing your life. You can't just stop doing it - you have to replace it with other things, ideally things that don't fit in with using. For some people that's a spiritual thing. For others it's social. I use exercise - I don't mean I just work out, I'm building a life around it, cos I know if I start using again I'll lose it and that's a powerful motivator for me.
If you've both talked and both think the subs are good, then go for it. If it's not the right way, ditch it and try something else. I like the attitude of, screw it, gotta start somewhere - this is a process, not a one-ff solution then done. Might as well make a start, right?
xxx