Buprenorphine is schedule 3 even when it's not combined with nalaxone. Naloxone has a high first pass metabolism so it's uneffective orally. It has a very close structure to oxymorphone which also has a high first pass metabolism. Naloxone is absorbed nasally and with IV use. I can definitely feel the naloxone snorting it. It's not that effective but it still has a small effect. You can get the same BA by mixing the bupe in an ethanol solution under the tongue.
Most people find that they can stop wd with low doses of sub if their habit isn't enormous. It's hard to find info on the peak plasma levels but I've seen 100-200 minutes listed as the peak so definitely wait a while after dosing bc you want to get by with the lowest effective dose. You can also get a high if your tolerance is low but I think it's slightly less enjoyable than regular opiates.