So the cheapest thing (and what I've done in my house) is to purchase rubber threshold ramps from Amazon (or spinlife, or possibly request some through PCP/PT/OT if that's a thing for you). Make only the minimal adjustments to flooring that you would've done anyway, and then set these mini ramps at each transition and trim them to the desired height and width. Mine showed up with about a 2" height, which I cut down to about 3/4" to match my door threshold. Put some grip tape on the bottom, call it a day. I also put in (well, had a contractor put in) a foam-based ramp in the garage, which has held up phenomenally well and looks nicer than the metal ramp outside (not as nice as the concrete in the back yard, but much cheaper).

But anyway, yeah -- threshold ramps make it so you really don't have to worry about perfect level. Although, I say that for wheelchair purposes, and your tripping concerns are maybe a different animal. If you go that route, buy one taller than you need and then cut it lengthwise at the proper height for your floor.