Yeah, I'd go with after normally, but if you're in a hurry, pop the trams then immediately put the strip(s) under your tongue and get on your merry way.
You can combine the two. It may not be a pleasant interaction/combo for everyone who has tried it, but tramadol should be totally fine to combine with buprenorphine.
either or. bupe last a long time and even with tramadol taking a few hours average to metabolise to the more potent O-desmethyl it's really personal preference.