It's very rare for someone to experience significant withdrawal from buprenorphine after taking Suboxone for 2-3 months. Especially if they don't take higher doses than needed and stay below 8mg for the majority of the time. And if they taper off of it it makes any nasty withdrawal side effects even less likely.
I keep forgetting to mention this, but first have you ever used gabapentin (Neurontin) during acute withdrawal? For many people it reduces the majority of daytime symptoms to a very bearable experience, although some people who've never used it before and don't have any tolerance to gabaergic drugs get really drowsy from it.
Baclofen is even better than gabapentin (or in my experience pregabalin, which is superior to gabapentin), when taken at moderate-high doses for opioid withdrawal. It's also fairly easy to access through a doctor, especially if they're sympathetic. If you take too much and mix it with alcohol or benzos it can end up really knocking you out and not a fun experience at all, but when used by itself it is fairly safe.
I'd really consider at least a moderate dose of gabapentin/pregabalin or better yet baclofen when you're ready to come off Suboxone or if you want to use it to get off Suboxone sooner. It works really well. While you're on Suboxone you can take small-moderate doses of it infrequently in the evening for instance to make sure it's okay for you and to get used to it, plus it will help with sleep and all that, and make it easier to function on Suboxone (especially when you first transition onto bupe).
Even with a nasty heroin habit or methadone dependency, 80-100mg of baclofen will keep me very functional, certainly enough to work and be around family. I may need to redose later in the day, but generally no more than 2x a day. I understand that a minority get side effects that make it impractical and some with certain preexisting conditions like bad major depression can also rarely be exacerbated, but the stuff works really, really well to stay functional while kicking during the day at work.
Only caveat of course is that, especially with baclofen and pregabalin, if taken in high doses every day for like six or more months it can lead to its own gabaergic type withdrawal when you stop taking it, but IME there's no reason to uses such doses every day once the acute withdrawal has worn off, and that's well, well under six months.
